{"id":2356,"date":"2026-08-27T08:40:18","date_gmt":"2026-08-27T08:40:18","guid":{"rendered":"https:\/\/chineseledlight.com\/?p=2356"},"modified":"2026-08-27T08:43:05","modified_gmt":"2026-08-27T08:43:05","slug":"led-retrofit-roi","status":"publish","type":"post","link":"https:\/\/chineseledlight.com\/fr\/led-retrofit-roi\/","title":{"rendered":"How to Calculate Commercial LED Retrofit ROI: Energy Savings, Maintenance Costs, and Payback"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>LED retrofit ROI measures the financial return generated by a commercial lighting upgrade after comparing the money invested with the energy, maintenance and operating costs avoided over a defined period.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A lighting salesman once shows you two numbers:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Old fixture:&nbsp;<strong>72W<\/strong>&nbsp;New LED:&nbsp;<strong>30W<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then comes the magic line.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cYou save 58%.\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But that number, by itself, tells me almost nothing about whether the project is financially sensible, because a commercial retrofit lives inside a real building\u2014with odd operating schedules, partially failed legacy lamps, night-shift installation, lifts, ballast losses, tariff changes, dimming controls and maintenance people who definitely aren&#8217;t working for free.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The spreadsheet looks clean.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Reality doesn&#8217;t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And I frankly believe this is where a lot of LED retrofit proposals become sales documents instead of investment analyses.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sixty percent savings?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sixty percent of what?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fixture wattage?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Annual lighting kWh?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Whole-building electricity?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Utility spend?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I&#8217;ve seen all four used almost interchangeably.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They aren&#8217;t.<\/p>\n\n\n\n<h2 id=\"start-with-the-four-numbers-that-actually-drive-led-retrofit-roi\" class=\"wp-block-heading\">Start With the Four Numbers That Actually Drive LED Retrofit ROI<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The formula everybody likes is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>ROI = (Total Financial Benefit \u2212 Project Cost) \u00f7 Project Cost \u00d7 100<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fine.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But I don&#8217;t start there.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not usually.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I start with:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Annual Savings = Annual Energy Savings + Annual Maintenance Savings + Other Recurring Savings<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Simple Payback = Net Project Cost \u00f7 Annual Savings<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>LED Retrofit ROI over N Years = [(Annual Savings \u00d7 N) \u2212 Net Project Cost] \u00f7 Net Project Cost \u00d7 100<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Easy math.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The inputs?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s where the trouble starts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A beautifully formatted ROI workbook with fake operating hours is still fake. So is one that assumes electricity stays at today&#8217;s rate forever, or conveniently treats LED maintenance as zero because the supplier printed \u201c50,000 hours\u201d on a datasheet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bad inputs stay bad.<\/p>\n\n\n\n<h2 id=\"step-1-measure-the-existing-lighting-load\" class=\"wp-block-heading\">Step 1: Measure the Existing Lighting Load<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Here&#8217;s one I&#8217;ve seen more than once.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Existing luminaire:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2 \u00d7 32W T8<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Someone types:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>64W<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Simple arithmetic.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Wrong system assumption.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There&#8217;s a ballast.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on ballast type, system input is higher than lamp wattage alone. The same issue exists with HID gear\u2014ballast losses don&#8217;t vanish because the proposal writer doesn&#8217;t want another column.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So for a meaningful project, measure actual system watts where practical.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#8217;s use:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Existing system power: 72W<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">New LED:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>30W<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Difference:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>42W<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fixture-level reduction:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>58.3%<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Good.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But we&#8217;re not done.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not close.<\/p>\n\n\n\n<h2 id=\"step-2-get-operating-hours-right\" class=\"wp-block-heading\">Step 2: Get Operating Hours Right<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is probably the most abused variable in retrofit economics.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Office?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe&nbsp;<strong>2,500\u20133,500 hours\/year<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Retail store?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Often&nbsp;<strong>4,000\u20135,000+<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Warehouse?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Depends on shifts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hospital?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Different world.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A 24\/7 police dispatch center?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now the savings pile up fast.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#8217;s use 1,000 fixtures and a 42W reduction.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2,000 h\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">42 \u00d7 1,000 \u00d7 2,000 \u00f7 1,000 =&nbsp;<strong>84,000 kWh\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>6,000 h\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>252,000 kWh\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Same LEDs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Same watts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Three times the annual energy saving.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s why I don&#8217;t trust a \u201c2.1-year payback\u201d unless the person presenting it can tell me where the operating-hour number came from.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Security schedule?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">BMS data?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Occupancy study?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Or somebody&#8217;s guess?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Big difference.<\/p>\n\n\n\n<h2 id=\"step-3-calculate-annual-led-energy-savings\" class=\"wp-block-heading\">Step 3: Calculate Annual LED Energy Savings<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The basic&nbsp;<strong>LED energy savings calculation<\/strong>&nbsp;is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Annual kWh Savings = (Existing Watts \u2212 LED Watts) \u00d7 Quantity \u00d7 Annual Hours \u00f7 1,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Take:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Existing power: 72W<\/li>\n\n\n\n<li>LED power: 30W<\/li>\n\n\n\n<li>Quantity: 1,000<\/li>\n\n\n\n<li>Annual operating time: 3,500 hours<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Then:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>(72 \u2212 30) \u00d7 1,000 \u00d7 3,500 \u00f7 1,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>147,000 kWh\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now use the electricity tariff.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Say:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$0.14\/kWh<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Annual electricity saving:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>147,000 \u00d7 $0.14 = $20,580<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now I have a number I can work with.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Twenty thousand five hundred eighty dollars.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not \u201c58%.\u201d<\/p>\n\n\n\n<h2 id=\"electricity-rates-can-change-the-investment-decision\" class=\"wp-block-heading\">Electricity Rates Can Change the Investment Decision<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Same 147,000 kWh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$0.08\/kWh<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Savings:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$11,760\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$0.14\/kWh<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Savings:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$20,580\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$0.25\/kWh<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Savings:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$36,750\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nothing changed in the ceiling.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The financial outcome moved massively.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And this is exactly why generic&nbsp;<strong>LED lighting payback period<\/strong>&nbsp;claims annoy me. An LED product doesn&#8217;t possess a fixed payback period like it possesses a wattage rating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Payback belongs to the project.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not the fixture.<\/p>\n\n\n\n<h2 id=\"step-4-calculate-the-real-commercial-lighting-retrofit-cost\" class=\"wp-block-heading\">Step 4: Calculate the Real Commercial Lighting Retrofit Cost<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Here&#8217;s the ugly truth.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fixture price isn&#8217;t retrofit cost.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You also have:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>retrofit fixture or kit<\/li>\n\n\n\n<li>driver<\/li>\n\n\n\n<li>mounting hardware<\/li>\n\n\n\n<li>adaptors<\/li>\n\n\n\n<li>freight<\/li>\n\n\n\n<li>import duty<\/li>\n\n\n\n<li>controls<\/li>\n\n\n\n<li>sensors<\/li>\n\n\n\n<li>installation<\/li>\n\n\n\n<li>commissioning<\/li>\n\n\n\n<li>disposal<\/li>\n\n\n\n<li>engineering<\/li>\n\n\n\n<li>permits where required<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">I&#8217;ve seen \u201ccheap\u201d retrofits become expensive after electricians discover they need to modify every ceiling opening.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That hurts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Suppose:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">LED products:&nbsp;<strong>$45,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Installation:&nbsp;<strong>$22,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Controls:&nbsp;<strong>$8,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Engineering \/ commissioning:&nbsp;<strong>$3,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gross project cost:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$78,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now we finally have a usable investment figure.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-lighting-engineer-comparing-existing-fluorescent-fixtures-with-an-LED-retrofit-system-1024x768.png\" alt=\"Commercial lighting engineer comparing existing fluorescent fixtures with an LED retrofit system\" class=\"wp-image-2359\" title=\"\" srcset=\"https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-lighting-engineer-comparing-existing-fluorescent-fixtures-with-an-LED-retrofit-system-1024x768.png 1024w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-lighting-engineer-comparing-existing-fluorescent-fixtures-with-an-LED-retrofit-system-300x225.png 300w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-lighting-engineer-comparing-existing-fluorescent-fixtures-with-an-LED-retrofit-system-768x576.png 768w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-lighting-engineer-comparing-existing-fluorescent-fixtures-with-an-LED-retrofit-system-16x12.png 16w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-lighting-engineer-comparing-existing-fluorescent-fixtures-with-an-LED-retrofit-system-600x450.png 600w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-lighting-engineer-comparing-existing-fluorescent-fixtures-with-an-LED-retrofit-system.png 1448w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Commercial lighting engineer comparing existing fluorescent fixtures with an LED retrofit system<\/figcaption><\/figure>\n\n\n\n<h2 id=\"rebates-and-incentives-change-net-project-cost\" class=\"wp-block-heading\">Rebates and Incentives Change Net Project Cost<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Assume:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$18,000 incentive<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Net cost:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$78,000 \u2212 $18,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>$60,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Energy savings:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$20,580\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Energy-only simple payback:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$60,000 \u00f7 $20,580 \u2248 2.92 years<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Without the incentive:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$78,000 \u00f7 $20,580 \u2248 3.79 years<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Almost one year.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One line item.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s why I always want a second calculation with&nbsp;<strong>no rebate<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the project only works because a rebate might exist six months from now, that&#8217;s something management should know.<\/p>\n\n\n\n<h2 id=\"the-2023-berkeley-retrofit-is-a-useful-real-world-example\" class=\"wp-block-heading\">The 2023 Berkeley Retrofit Is a Useful Real-World Example<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A public-sector project makes this less theoretical.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DOE&#8217;s Integrated Lighting Campaign documented a&nbsp;<strong>2023 City of Berkeley<\/strong>&nbsp;retrofit at a 24\/7 public-safety building containing fire and police offices, an emergency operations center, 911 dispatch and a city jail.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The project upgraded fluorescent lighting and controls, while incentives, grants and zero-interest on-bill financing supported the economics. DOE reported roughly&nbsp;<strong>$250,000 in financing cost over ten years<\/strong>, while the estimated cost of&nbsp;<strong>336,573 kWh of unconserved electricity<\/strong>&nbsp;would have exceeded&nbsp;<strong>$120,000 annually<\/strong>\u2014more than $1 million over that same decade. (<a href=\"https:\/\/integratedlightingcampaign.energy.gov\/2023-recognized-partner-city-berkeley?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">integratedlightingcampaign.energy.gov<\/a>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/integratedlightingcampaign.energy.gov\/2023-recognized-partner-city-berkeley?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">DOE Integrated Lighting Campaign \u2013 City of Berkeley project<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I like this example because it isn&#8217;t just \u201cLED good, fluorescent bad.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It shows financing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cash flow.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Actual energy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Much more useful.<\/p>\n\n\n\n<h2 id=\"step-5-add-maintenance-savings\" class=\"wp-block-heading\">Step 5: Add Maintenance Savings<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Now we get into the stuff that rarely gets a big glossy chart.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Old system:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>lamps fail<\/li>\n\n\n\n<li>ballasts fail<\/li>\n\n\n\n<li>somebody orders replacements<\/li>\n\n\n\n<li>somebody stores replacements<\/li>\n\n\n\n<li>somebody climbs up there<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">LED doesn&#8217;t erase maintenance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But it can reduce it significantly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Suppose old-system average maintenance:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$9,000\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">New LED system:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$3,000\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Savings:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$6,000\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Add that to energy:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$20,580 + $6,000 = $26,580\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$60,000 \u00f7 $26,580 \u2248 2.26 years<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s a big change.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And nothing about the lamp efficacy changed.<\/p>\n\n\n\n<h2 id=\"maintenance-savings-are-often-underestimated\" class=\"wp-block-heading\">Maintenance Savings Are Often Underestimated<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A lamp is cheap.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Access isn&#8217;t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Warehouse ceiling at 10 meters?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You might need a scissor lift, technician, spotter, safety procedure and production coordination just to reach one bad fixture.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The failed component could be worth:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$80<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The service event could easily be:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$250\u2013$500+<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s why&nbsp;<a href=\"https:\/\/chineseledlight.com\/retrofit\/\">commercial LED retrofit products<\/a>&nbsp;can be particularly attractive in difficult-access applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maintenance is where reliability turns into money.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Very quickly.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-LED-retrofit-installation-showing-labor-access-equipment-and-fixture-replacement-costs-1024x768.png\" alt=\"Commercial LED retrofit installation showing labor, access equipment and fixture replacement costs\" class=\"wp-image-2358\" title=\"\" srcset=\"https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-LED-retrofit-installation-showing-labor-access-equipment-and-fixture-replacement-costs-1024x768.png 1024w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-LED-retrofit-installation-showing-labor-access-equipment-and-fixture-replacement-costs-300x225.png 300w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-LED-retrofit-installation-showing-labor-access-equipment-and-fixture-replacement-costs-768x576.png 768w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-LED-retrofit-installation-showing-labor-access-equipment-and-fixture-replacement-costs-16x12.png 16w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-LED-retrofit-installation-showing-labor-access-equipment-and-fixture-replacement-costs-600x450.png 600w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/Commercial-LED-retrofit-installation-showing-labor-access-equipment-and-fixture-replacement-costs.png 1448w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Commercial LED retrofit installation showing labor, access equipment and fixture replacement costs<\/figcaption><\/figure>\n\n\n\n<h2 id=\"don-t-invent-maintenance-savings\" class=\"wp-block-heading\">Don&#8217;t Invent Maintenance Savings<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Yet this cuts both ways.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I&#8217;ve seen a sales model claim:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Old lighting requires full relamping every year.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">New LED requires zero maintenance for ten years.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Convenient story.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From my experience, that should make you stop and ask for the source data.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Use:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>maintenance logs<\/li>\n\n\n\n<li>lamp purchase records<\/li>\n\n\n\n<li>ballast failures<\/li>\n\n\n\n<li>driver claims<\/li>\n\n\n\n<li>labor rate<\/li>\n\n\n\n<li>access equipment cost<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If you&#8217;re missing data, model a range.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Uncertainty is fine.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pretending there isn&#8217;t any isn&#8217;t.<\/p>\n\n\n\n<h2 id=\"step-6-calculate-simple-payback\" class=\"wp-block-heading\">Step 6: Calculate Simple Payback<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Now:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Simple Payback = Net Project Cost \u00f7 Annual Savings<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our example:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$60,000 \u00f7 $26,580 \u2248 2.26 years<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Everybody understands this.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s why simple payback survives.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But it has a blind spot.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A big one.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It stops caring after the investment is recovered.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Year three?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Year five?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Year ten?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not its problem.<\/p>\n\n\n\n<h2 id=\"step-7-calculate-led-lighting-return-on-investment\" class=\"wp-block-heading\">Step 7: Calculate LED Lighting Return on Investment<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#8217;s use five years.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Annual savings:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$26,580<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Five-year savings:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$132,900<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Initial net investment:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$60,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Net benefit:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$72,900<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ROI:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$72,900 \u00f7 $60,000 \u00d7 100<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>121.5%<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Five-year LED retrofit ROI = 121.5%<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s a different metric from payback.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two projects can have similar payback and wildly different long-term financial value.<\/p>\n\n\n\n<h2 id=\"example-commercial-led-retrofit-calculation\" class=\"wp-block-heading\">Example Commercial LED Retrofit Calculation<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Item<\/th><th class=\"has-text-align-right\" data-align=\"right\">Existing Lighting<\/th><th class=\"has-text-align-right\" data-align=\"right\">LED Retrofit<\/th><\/tr><\/thead><tbody><tr><td>Fixture quantity<\/td><td class=\"has-text-align-right\" data-align=\"right\">1,000<\/td><td class=\"has-text-align-right\" data-align=\"right\">1,000<\/td><\/tr><tr><td>System watts\/fixture<\/td><td class=\"has-text-align-right\" data-align=\"right\">72W<\/td><td class=\"has-text-align-right\" data-align=\"right\">30W<\/td><\/tr><tr><td>Annual hours<\/td><td class=\"has-text-align-right\" data-align=\"right\">3,500<\/td><td class=\"has-text-align-right\" data-align=\"right\">3,500<\/td><\/tr><tr><td>Annual energy<\/td><td class=\"has-text-align-right\" data-align=\"right\">252,000 kWh<\/td><td class=\"has-text-align-right\" data-align=\"right\">105,000 kWh<\/td><\/tr><tr><td>Annual energy cost @ $0.14<\/td><td class=\"has-text-align-right\" data-align=\"right\">$35,280<\/td><td class=\"has-text-align-right\" data-align=\"right\">$14,700<\/td><\/tr><tr><td>Annual maintenance<\/td><td class=\"has-text-align-right\" data-align=\"right\">$9,000<\/td><td class=\"has-text-align-right\" data-align=\"right\">$3,000<\/td><\/tr><tr><td>Annual operating cost<\/td><td class=\"has-text-align-right\" data-align=\"right\">$44,280<\/td><td class=\"has-text-align-right\" data-align=\"right\">$17,700<\/td><\/tr><tr><td><strong>Annual savings<\/strong><\/td><td class=\"has-text-align-right\" data-align=\"right\"><\/td><td class=\"has-text-align-right\" data-align=\"right\"><strong>$26,580<\/strong><\/td><\/tr><tr><td>Net project cost<\/td><td class=\"has-text-align-right\" data-align=\"right\"><\/td><td class=\"has-text-align-right\" data-align=\"right\"><strong>$60,000<\/strong><\/td><\/tr><tr><td><strong>Simple payback<\/strong><\/td><td class=\"has-text-align-right\" data-align=\"right\"><\/td><td class=\"has-text-align-right\" data-align=\"right\"><strong>2.26 years<\/strong><\/td><\/tr><tr><td><strong>5-year ROI<\/strong><\/td><td class=\"has-text-align-right\" data-align=\"right\"><\/td><td class=\"has-text-align-right\" data-align=\"right\"><strong>121.5%<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s a table I&#8217;d actually show procurement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not a giant \u201cSAVE 58%\u201d graphic.<\/p>\n\n\n\n<h2 id=\"payback-can-be-misleading-when-fixture-quantities-change\" class=\"wp-block-heading\">Payback Can Be Misleading When Fixture Quantities Change<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">However, one-for-one replacement is not sacred.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Existing installation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1,000 fixtures<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Supplier A proposes:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1,000 LEDs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Supplier B proposes:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">850 LEDs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Why?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Better optical control. Higher useful output. Wider spacing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now Supplier B may have a higher unit price but lower:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>fixture count<\/li>\n\n\n\n<li>installation labor<\/li>\n\n\n\n<li>control-point count<\/li>\n\n\n\n<li>maintenance-point count<\/li>\n\n\n\n<li>connected load<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is where&nbsp;<a href=\"https:\/\/chineseledlight.com\/project-support\/?utm_source=chatgpt.com\">SENLUX project lighting support<\/a>&nbsp;matters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Photometry changes the financial model.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And this is one reason I dislike quotation-only comparisons.<\/p>\n\n\n\n<h2 id=\"retrofit-kit-vs-complete-fixture-replacement\" class=\"wp-block-heading\">Retrofit Kit vs Complete Fixture Replacement<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sometimes you don&#8217;t need a complete new luminaire.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe the existing housing is solid.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe wiring is reusable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe the ceiling opening is awkward.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then retrofit kits become interesting.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Potential upside:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>lower material spend<\/li>\n\n\n\n<li>faster install<\/li>\n\n\n\n<li>less demolition<\/li>\n\n\n\n<li>less waste<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">But check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>thermal path<\/li>\n\n\n\n<li>wiring condition<\/li>\n\n\n\n<li>control compatibility<\/li>\n\n\n\n<li>photometric behavior<\/li>\n\n\n\n<li>certification implications<\/li>\n\n\n\n<li>mounting<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A cheap retrofit kit that requires ten minutes of field modification per fixture stops being cheap very quickly.<\/p>\n\n\n\n<h2 id=\"gsa-s-2024-guidance-gives-us-actual-payback-ranges\" class=\"wp-block-heading\">GSA&#8217;s 2024 Guidance Gives Us Actual Payback Ranges<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">GSA&#8217;s 2024&nbsp;<strong>LED Lighting and Controls Guidance<\/strong>&nbsp;modeled a&nbsp;<strong>50,000 ft\u00b2<\/strong>&nbsp;building with a baseline of three-lamp 32W fluorescent fixtures,&nbsp;<strong>2,900 annual operating hours<\/strong>&nbsp;and electricity at&nbsp;<strong>$0.11\/kWh<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its modeled&nbsp;<strong>retrofit kit with zone-based controls<\/strong>&nbsp;showed around&nbsp;<strong>65% energy savings<\/strong>, $1.67\/ft\u00b2 first cost and an&nbsp;<strong>8.1-year simple payback<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A centrally networked luminaire-level-control retrofit reached roughly&nbsp;<strong>70% energy savings<\/strong>, $2.45\/ft\u00b2 first cost and an&nbsp;<strong>11-year payback<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But when centrally networked controls also integrated HVAC functions, modeled payback fell to&nbsp;<strong>6.4 years<\/strong>&nbsp;because additional building-level savings entered the equation. (<a href=\"https:\/\/www.gsa.gov\/system\/files\/LED%20and%20Controls%20Guidance%20for%20GSA-PDF-01-31-24.pdf?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">gsa.gov<\/a>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.gsa.gov\/system\/files\/LED%20and%20Controls%20Guidance%20for%20GSA.pdf?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">GSA 2024 LED Lighting and Controls Guidance<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Same broad project type.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Payback from roughly six to eleven years.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So much for the universal two-year retrofit.<\/p>\n\n\n\n<h2 id=\"controls-can-make-roi-better-or-worse\" class=\"wp-block-heading\">Controls Can Make ROI Better\u2014or Worse<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Controls save energy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Usually.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do they improve ROI?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Different question.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You might add:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>occupancy sensors<\/li>\n\n\n\n<li>daylight harvesting<\/li>\n\n\n\n<li>network nodes<\/li>\n\n\n\n<li>gateways<\/li>\n\n\n\n<li>DALI drivers<\/li>\n\n\n\n<li>commissioning<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">All of that costs money.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">GSA reported in November 2024 that new plug-and-play LED fixtures with integrated advanced controls installed at federal buildings in Chicago and Atlanta maintained lighting quality while producing&nbsp;<strong>69% lighting-energy savings relative to the GSA average and a 40% ROI<\/strong>. (<a href=\"https:\/\/www.gsa.gov\/governmentwide-initiatives\/federal-highperformance-buildings\/highperformance-building-clearinghouse\/completed-assessments\/lighting\/led-fixtures-with-integrated-controls?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">gsa.gov<\/a>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.gsa.gov\/governmentwide-initiatives\/federal-highperformance-buildings\/highperformance-building-clearinghouse\/completed-assessments\/lighting\/led-fixtures-with-integrated-controls?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">GSA integrated LED fixtures and advanced controls assessment<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Good case.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Very good.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But it isn&#8217;t the whole story.<\/p>\n\n\n\n<h2 id=\"another-gsa-project-is-the-warning-buyers-need\" class=\"wp-block-heading\">Another GSA Project Is the Warning Buyers Need<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">GSA also documented another field assessment where advanced controls cut LED lighting energy by&nbsp;<strong>43%<\/strong>, yet those additional energy savings didn&#8217;t recover the incremental control-system cost at that site.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s the uncomfortable result.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And I like it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because GSA pointed out that facilities with higher utility rates or longer occupied hours could still deliver positive life-cycle economics. (<a href=\"https:\/\/www.gsa.gov\/governmentwide-initiatives\/federal-highperformance-buildings\/highperformance-building-clearinghouse\/completed-assessments\/lighting\/advanced-lighting-controls?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">gsa.gov<\/a>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Energy savings percentage is not ROI.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I can&#8217;t say that enough.<\/p>\n\n\n\n<h2 id=\"do-not-add-control-savings-percentages-together\" class=\"wp-block-heading\">Do Not Add Control Savings Percentages Together<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is spreadsheet nonsense I still see.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">LED conversion:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>50%<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Occupancy sensing:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>24%<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Daylighting:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>28%<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Someone adds them.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">GSA&#8217;s 2024 guidance specifically explains that combined savings from multiple control strategies are multiplicative, not simply additive. Two measures each saving 25% result in about&nbsp;<strong>44% combined savings<\/strong>, not 50%. (<a href=\"https:\/\/www.gsa.gov\/system\/files\/LED%20and%20Controls%20Guidance%20for%20GSA.pdf?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">gsa.gov<\/a>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Formula:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Combined Savings = ES1 + ES2 \u2212 (ES1 \u00d7 ES2)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">50% + 24%<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">0.50 + 0.24 \u2212 (0.50 \u00d7 0.24)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>62%<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not 74%.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Small spreadsheet error?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not really.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It can distort the whole business case.<\/p>\n\n\n\n<h2 id=\"baseline-accuracy-makes-or-breaks-the-roi\" class=\"wp-block-heading\">Baseline Accuracy Makes or Breaks the ROI<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">But what if the drawing says one thing and the ceiling says another?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Happens.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Old drawing:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>400W metal halide<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Actual site:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">half already retrofitted to 320W lamps.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you calculate savings against the old schedule, you&#8217;ve inflated the baseline.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So audit:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>actual fixture type<\/li>\n\n\n\n<li>actual wattage<\/li>\n\n\n\n<li>quantity<\/li>\n\n\n\n<li>existing failures<\/li>\n\n\n\n<li>switching<\/li>\n\n\n\n<li>controls<\/li>\n\n\n\n<li>operating hours<\/li>\n\n\n\n<li>current light levels<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Baseline first.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then ROI.<\/p>\n\n\n\n<h2 id=\"a-dead-fixture-does-not-save-energy-twice\" class=\"wp-block-heading\">A Dead Fixture Does Not Save Energy Twice<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Here&#8217;s another awkward example.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The building has:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1,000 fluorescent fixtures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">100 are dead.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your proposal assumes all 1,000 are consuming full power today.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They&#8217;re not.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then the retrofit restores all 1,000 locations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lighting improves\u2014but your calculated baseline energy may have been too high.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I&#8217;ve seen this overlooked.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A lot.<\/p>\n\n\n\n<h2 id=\"utility-bills-are-useful-but-lighting-is-only-part-of-them\" class=\"wp-block-heading\">Utility Bills Are Useful, But Lighting Is Only Part of Them<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Suppose annual building electricity is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1,000,000 kWh<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Retrofit predicts:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>200,000 kWh reduction<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After construction, utility bills fall only:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>130,000 kWh<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Did the lighting underperform?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Or:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>summer was hotter<\/li>\n\n\n\n<li>HVAC operated longer<\/li>\n\n\n\n<li>production increased<\/li>\n\n\n\n<li>occupancy changed<\/li>\n\n\n\n<li>building schedule changed<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Whole-building bills are useful, but they aren&#8217;t always clean lighting M&amp;V.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For large projects, isolate the lighting load where practical.<\/p>\n\n\n\n<h2 id=\"connected-load-vs-actual-consumption\" class=\"wp-block-heading\">Connected Load vs Actual Consumption<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Installed lighting load:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>100 kW<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Annual schedule:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4,000 hours<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Naive annual energy:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>400,000 kWh<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But controls cut effective usage by 35%.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Actual effective lighting energy:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>260,000 kWh<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So don&#8217;t confuse:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>connected load<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">with:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>annual energy consumption<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Different animals.<\/p>\n\n\n\n<h2 id=\"heat-reduction-can-create-secondary-hvac-savings\" class=\"wp-block-heading\">Heat Reduction Can Create Secondary HVAC Savings<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Yes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lower lighting watts generally means less internal heat in conditioned spaces.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cooling demand may drop.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But it&#8217;s not free money everywhere.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In winter, reduced internal gains can slightly increase heating demand.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Climate matters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HVAC efficiency matters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Building type matters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So if HVAC savings are small, I leave them out.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Conservative.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If they&#8217;re material, model them properly.<\/p>\n\n\n\n<h2 id=\"the-retrofit-can-save-labor-before-it-saves-electricity\" class=\"wp-block-heading\">The Retrofit Can Save Labor Before It Saves Electricity<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A big fluorescent estate has a rhythm.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lamp fails.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Technician goes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ballast dies.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Technician goes again.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Stock gets reordered.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Someone counts old lamps.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It adds up.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In facilities with expensive access\u2014airports, factories, hospitals, high-bay warehouses\u2014<strong>lighting maintenance cost savings<\/strong>&nbsp;can move the ROI faster than many buyers expect.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s not glamorous.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It&#8217;s real.<\/p>\n\n\n\n<h2 id=\"access-cost-is-application-specific\" class=\"wp-block-heading\">Access Cost Is Application-Specific<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Office troffer?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Easy enough.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Warehouse high bay at 12 meters?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not the same job.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Airport?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Worse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Production plant requiring shutdown?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now you&#8217;re paying for more than a technician.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So use:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Replacement Event Cost = Part + Labor + Access + Downtime where relevant<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The failed LED driver might be the cheapest part of the whole event.<\/p>\n\n\n\n<h2 id=\"failure-assumptions-need-conservative-scenarios\" class=\"wp-block-heading\">Failure Assumptions Need Conservative Scenarios<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u201c50,000 hours.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That phrase gets abused.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It doesn&#8217;t mean zero failures for 50,000 hours.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It certainly doesn&#8217;t mean every driver reaches hour 50,000.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So model:<\/p>\n\n\n\n<h3 id=\"optimistic\" class=\"wp-block-heading\">Optimistic<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">1% failures<\/p>\n\n\n\n<h3 id=\"expected\" class=\"wp-block-heading\">Expected<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">3%<\/p>\n\n\n\n<h3 id=\"stress-case\" class=\"wp-block-heading\">Stress case<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">7%<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then see what happens to ROI.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the project survives the stress case?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Much better.<\/p>\n\n\n\n<h2 id=\"quality-affects-led-retrofit-roi\" class=\"wp-block-heading\">Quality Affects LED Retrofit ROI<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cheap kit:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$22<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Better kit:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$29<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Difference:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$7<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Across 5,000 units:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$35,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s not trivial.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But suppose the cheaper product generates 300 extra service events.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$150 each<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">that&#8217;s:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$45,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There goes the \u201csaving.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s why&nbsp;<a href=\"https:\/\/chineseledlight.com\/led-lighting-quality-control\/\">LED lighting quality control and traceability<\/a>&nbsp;belongs in the ROI discussion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quality problems don&#8217;t stay inside the QC department.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They become invoices.<\/p>\n\n\n\n<h2 id=\"retrofit-product-compatibility-matters\" class=\"wp-block-heading\">Retrofit Product Compatibility Matters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cDrop-in retrofit.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Good phrase.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Until it doesn&#8217;t drop in.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before bulk order, verify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>dimensions<\/li>\n\n\n\n<li>cutout<\/li>\n\n\n\n<li>wiring<\/li>\n\n\n\n<li>voltage<\/li>\n\n\n\n<li>track compatibility<\/li>\n\n\n\n<li>emergency operation<\/li>\n\n\n\n<li>dimming<\/li>\n\n\n\n<li>controls<\/li>\n\n\n\n<li>ceiling condition<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">One little bracket problem multiplied by 10,000 is no longer little.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s project math.<\/p>\n\n\n\n<h2 id=\"installation-time-should-be-measured\" class=\"wp-block-heading\">Installation Time Should Be Measured<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Product A:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">10 minutes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Product B:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">16 minutes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Difference:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">6 minutes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Across 5,000 fixtures:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>30,000 minutes<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>500 labor hours<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$50\/hour<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>$25,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So Supplier B can be $4 cheaper per unit and still lose financially.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I like pilot installs for this reason.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You learn things catalogues don&#8217;t tell you.<\/p>\n\n\n\n<h2 id=\"retrofit-at-night-include-overtime\" class=\"wp-block-heading\">Retrofit at Night? Include Overtime<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Retail store stays open.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Airport stays open.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Factory runs production all day.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Installation moves to:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>10 p.m.\u20136 a.m.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now labor costs change.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your ROI model assumes daytime rates, it&#8217;s wrong before the first carton arrives.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Simple.<\/p>\n\n\n\n<h2 id=\"project-phasing-can-affect-roi\" class=\"wp-block-heading\">Project Phasing Can Affect ROI<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Twenty stores.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">All now?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Or five every quarter?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Earlier stores begin generating savings first.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bulk ordering might reduce purchase price.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Later phases preserve cash.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Portfolio ROI isn&#8217;t always one single project-start date.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Timing matters.<\/p>\n\n\n\n<h2 id=\"the-payback-clock-starts-when-the-lights-operate\" class=\"wp-block-heading\">The Payback Clock Starts When the Lights Operate<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An approved project doesn&#8217;t save anything.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An installed project does.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certification delay?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Development delay?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Shipping delay?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Construction delay?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The payback clock waits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So if one option costs slightly more but can ship immediately while another requires six months of custom development, the cheaper fixture may not be the cheaper financial choice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Opportunity cost is real.<\/p>\n\n\n\n<h2 id=\"financing-can-turn-a-good-project-into-an-easier-decision\" class=\"wp-block-heading\">Financing Can Turn a Good Project Into an Easier Decision<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The Berkeley project is a nice example because financing changed the cash-flow shape.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It used utility on-bill financing with zero-interest funding, with the monthly loan payment intended to be at or below the monthly energy-cost savings. (<a href=\"https:\/\/integratedlightingcampaign.energy.gov\/2023-recognized-partner-city-berkeley?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">integratedlightingcampaign.energy.gov<\/a>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s powerful.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The project doesn&#8217;t need to wait years before cash flow feels better.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Different funding structure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Same lighting.<\/p>\n\n\n\n<h2 id=\"don-t-confuse-roi-with-cash-flow\" class=\"wp-block-heading\">Don&#8217;t Confuse ROI With Cash Flow<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A project can have excellent ROI and still be difficult to fund.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$500,000 upfront<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$150,000\/year savings<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Strong economics.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Still needs half a million dollars.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Finance sees that.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lighting designers sometimes don&#8217;t.<\/p>\n\n\n\n<h2 id=\"simple-payback-ignores-what-happens-after-payback\" class=\"wp-block-heading\">Simple Payback Ignores What Happens After Payback<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Project A:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2-year payback.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">7-year useful horizon.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Project B:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3-year payback.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">15-year useful horizon.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Which is better?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No idea.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not from payback.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s why lifecycle analysis exists.<\/p>\n\n\n\n<h2 id=\"net-present-value-is-better-for-large-projects\" class=\"wp-block-heading\">Net Present Value Is Better for Large Projects<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For larger capital investments:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>NPV = Present Value of Future Savings \u2212 Initial Investment<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Conceptually:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>PV = Future Cash Flow \u00f7 (1 + r)^t<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>r<\/code>\u00a0= discount rate<\/li>\n\n\n\n<li><code>t<\/code>\u00a0= year<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Money in year ten isn&#8217;t worth exactly the same as money today.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Finance departments know this.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your LED spreadsheet should too.<\/p>\n\n\n\n<h2 id=\"internal-rate-of-return-can-help-capital-ranking\" class=\"wp-block-heading\">Internal Rate of Return Can Help Capital Ranking<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Lighting competes with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HVAC<\/li>\n\n\n\n<li>solar<\/li>\n\n\n\n<li>automation<\/li>\n\n\n\n<li>production machinery<\/li>\n\n\n\n<li>building envelope upgrades<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">IRR lets finance compare the return profile of these projects.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lighting doesn&#8217;t deserve capital because it&#8217;s lighting.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It has to earn it.<\/p>\n\n\n\n<h2 id=\"a-more-complete-retrofit-financial-model\" class=\"wp-block-heading\">A More Complete Retrofit Financial Model<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Initial cost:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>equipment<\/li>\n\n\n\n<li>freight<\/li>\n\n\n\n<li>controls<\/li>\n\n\n\n<li>installation<\/li>\n\n\n\n<li>disposal<\/li>\n\n\n\n<li>engineering<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Subtract:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>rebates<\/li>\n\n\n\n<li>incentives<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Annual benefit:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>energy saving<\/li>\n\n\n\n<li>maintenance saving<\/li>\n\n\n\n<li>credible HVAC impact<\/li>\n\n\n\n<li>other measurable operating savings<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Then:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>replacements<\/li>\n\n\n\n<li>inflation\/escalation<\/li>\n\n\n\n<li>discounting<\/li>\n\n\n\n<li>residual value<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Now the ROI starts looking like a capital model instead of a marketing calculator.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/LED-retrofit-ROI-analysis-comparing-energy-savings-maintenance-costs-and-payback-1024x768.png\" alt=\"LED retrofit ROI analysis comparing energy savings, maintenance costs and payback\" class=\"wp-image-2357\" title=\"\" srcset=\"https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/LED-retrofit-ROI-analysis-comparing-energy-savings-maintenance-costs-and-payback-1024x768.png 1024w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/LED-retrofit-ROI-analysis-comparing-energy-savings-maintenance-costs-and-payback-300x225.png 300w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/LED-retrofit-ROI-analysis-comparing-energy-savings-maintenance-costs-and-payback-768x576.png 768w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/LED-retrofit-ROI-analysis-comparing-energy-savings-maintenance-costs-and-payback-16x12.png 16w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/LED-retrofit-ROI-analysis-comparing-energy-savings-maintenance-costs-and-payback-600x450.png 600w, https:\/\/chineseledlight.com\/wp-content\/uploads\/2026\/08\/LED-retrofit-ROI-analysis-comparing-energy-savings-maintenance-costs-and-payback.png 1448w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">LED retrofit ROI analysis comparing energy savings, maintenance costs and payback<\/figcaption><\/figure>\n\n\n\n<h2 id=\"led-retrofit-roi-calculation-example-full-version\" class=\"wp-block-heading\">LED Retrofit ROI Calculation Example: Full Version<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#8217;s take:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2,500 fixtures<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Existing:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>96W<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">LED:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>40W<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Operating:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4,200 h\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Electricity:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$0.13\/kWh<\/strong><\/p>\n\n\n\n<h3 id=\"energy-reduction\" class=\"wp-block-heading\">Energy reduction<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Difference:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>56W<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Annual kWh savings:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">56 \u00d7 2,500 \u00d7 4,200 \u00f7 1,000<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>588,000 kWh<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Annual energy savings:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">588,000 \u00d7 $0.13<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>$76,440<\/strong><\/p>\n\n\n\n<h3 id=\"maintenance\" class=\"wp-block-heading\">Maintenance<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Existing:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$28,000\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">LED:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$8,000\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Savings:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$20,000<\/strong><\/p>\n\n\n\n<h3 id=\"total-annual-savings\" class=\"wp-block-heading\">Total annual savings<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$96,440<\/strong><\/p>\n\n\n\n<h3 id=\"project-cost\" class=\"wp-block-heading\">Project cost<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Products:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$180,000<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Installation:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$90,000<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Controls:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$35,000<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Engineering:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$10,000<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gross:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$315,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Incentive:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$50,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Net:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$265,000<\/strong><\/p>\n\n\n\n<h3 id=\"simple-payback\" class=\"wp-block-heading\">Simple payback<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">265,000 \u00f7 96,440<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2248&nbsp;<strong>2.75 years<\/strong><\/p>\n\n\n\n<h3 id=\"five-year-simple-roi\" class=\"wp-block-heading\">Five-year simple ROI<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Five-year savings:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">96,440 \u00d7 5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>$482,200<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Net benefit:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">482,200 \u2212 265,000<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>$217,200<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ROI:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">217,200 \u00f7 265,000 \u00d7 100<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2248&nbsp;<strong>82%<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Good-looking result.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now attack it.<\/p>\n\n\n\n<h2 id=\"now-stress-test-it\" class=\"wp-block-heading\">Now Stress-Test It<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">What if annual hours are 15% lower?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What if electricity drops to $0.10\/kWh?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What if the rebate disappears?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What if maintenance savings are only half what we assumed?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Run the model again.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And again.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s the real test.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Anybody can make the base case look pretty.<\/p>\n\n\n\n<h2 id=\"sensitivity-table\" class=\"wp-block-heading\">Sensitivity Table<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Scenario<\/th><th class=\"has-text-align-right\" data-align=\"right\">Annual Savings<\/th><th class=\"has-text-align-right\" data-align=\"right\">Net Cost<\/th><th class=\"has-text-align-right\" data-align=\"right\">Simple Payback<\/th><\/tr><\/thead><tbody><tr><td>Optimistic<\/td><td class=\"has-text-align-right\" data-align=\"right\">$110,000<\/td><td class=\"has-text-align-right\" data-align=\"right\">$250,000<\/td><td class=\"has-text-align-right\" data-align=\"right\">2.27 yrs<\/td><\/tr><tr><td>Base Case<\/td><td class=\"has-text-align-right\" data-align=\"right\">$96,440<\/td><td class=\"has-text-align-right\" data-align=\"right\">$265,000<\/td><td class=\"has-text-align-right\" data-align=\"right\">2.75 yrs<\/td><\/tr><tr><td>Conservative<\/td><td class=\"has-text-align-right\" data-align=\"right\">$75,000<\/td><td class=\"has-text-align-right\" data-align=\"right\">$280,000<\/td><td class=\"has-text-align-right\" data-align=\"right\">3.73 yrs<\/td><\/tr><tr><td>Stress Case<\/td><td class=\"has-text-align-right\" data-align=\"right\">$60,000<\/td><td class=\"has-text-align-right\" data-align=\"right\">$300,000<\/td><td class=\"has-text-align-right\" data-align=\"right\">5.00 yrs<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">If management still likes the project at 3.73 years?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Good sign.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If everything collapses as soon as one assumption moves 10%?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fragile project.<\/p>\n\n\n\n<h2 id=\"a-good-led-retrofit-payback-calculator-needs-more-than-watts\" class=\"wp-block-heading\">A Good LED Retrofit Payback Calculator Needs More Than Watts<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If I&#8217;m building the spreadsheet, I want:<\/p>\n\n\n\n<h3 id=\"existing-system\" class=\"wp-block-heading\">Existing system<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>quantity<\/li>\n\n\n\n<li>actual wattage<\/li>\n\n\n\n<li>operating hours<\/li>\n\n\n\n<li>maintenance frequency<\/li>\n<\/ul>\n\n\n\n<h3 id=\"proposed-led\" class=\"wp-block-heading\">Proposed LED<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>actual system watts<\/li>\n\n\n\n<li>required quantity<\/li>\n\n\n\n<li>fixture cost<\/li>\n\n\n\n<li>expected maintenance<\/li>\n<\/ul>\n\n\n\n<h3 id=\"financial-inputs\" class=\"wp-block-heading\">Financial inputs<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>tariff<\/li>\n\n\n\n<li>labor<\/li>\n\n\n\n<li>installation<\/li>\n\n\n\n<li>incentives<\/li>\n\n\n\n<li>analysis period<\/li>\n\n\n\n<li>discount rate<\/li>\n<\/ul>\n\n\n\n<h3 id=\"controls\" class=\"wp-block-heading\">Controls<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>occupancy<\/li>\n\n\n\n<li>scheduling<\/li>\n\n\n\n<li>task tuning<\/li>\n\n\n\n<li>daylight response<\/li>\n<\/ul>\n\n\n\n<h3 id=\"outputs\" class=\"wp-block-heading\">Outputs<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>kWh savings<\/li>\n\n\n\n<li>dollar savings<\/li>\n\n\n\n<li>maintenance savings<\/li>\n\n\n\n<li>payback<\/li>\n\n\n\n<li>ROI<\/li>\n\n\n\n<li>NPV<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s an&nbsp;<strong>LED retrofit payback calculator<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two boxes labeled \u201cOld Watts\u201d and \u201cNew Watts\u201d?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s a toy.<\/p>\n\n\n\n<h2 id=\"never-compare-non-equivalent-lighting-results\" class=\"wp-block-heading\">Never Compare Non-Equivalent Lighting Results<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Old office:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">500 lux.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">LED proposal:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">350 lux.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Savings look excellent.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Well, yes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You removed light.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So verify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>illuminance<\/li>\n\n\n\n<li>uniformity<\/li>\n\n\n\n<li>glare<\/li>\n\n\n\n<li>CCT\/color quality<\/li>\n\n\n\n<li>photometric distribution<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For&nbsp;<a href=\"https:\/\/chineseledlight.com\/down-lighting\/\">downlighting systems<\/a>, similar lumen output does not guarantee similar useful light on the workplane.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Technical equivalence first.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Financial comparison second.<\/p>\n\n\n\n<h2 id=\"one-for-one-replacement-isn-t-always-optimal\" class=\"wp-block-heading\">\u201cOne-for-One Replacement\u201d Isn&#8217;t Always Optimal<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Legacy ceiling:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1,000 luminaires.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">New design:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">must it also be 1,000?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not necessarily.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe better optics allow 850.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe the ceiling grid forces 1,000.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe 900 works.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Run the calculation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One-for-one is convenient.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It isn&#8217;t a design law.<\/p>\n\n\n\n<h2 id=\"retrofit-controls-should-be-evaluated-incrementally\" class=\"wp-block-heading\">Retrofit Controls Should Be Evaluated Incrementally<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">I like splitting this out.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">First:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>LED-only retrofit<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>LED + controls<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Suppose LED-only:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$200,000 investment $80,000 annual savings<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Controls add:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$60,000<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Controls add savings:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">$15,000\/year<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Incremental control payback:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$60,000 \u00f7 $15,000 = 4 years<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now you know what that controls package is actually buying you.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Much cleaner.<\/p>\n\n\n\n<h2 id=\"high-operating-hours-are-roi-gold\" class=\"wp-block-heading\">High Operating Hours Are ROI Gold<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">High hours.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">High watts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">High maintenance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s where retrofit projects usually get exciting.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hospitals.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Factories.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Parking structures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Call centers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Warehouses.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">GSA&#8217;s occupant-responsive-lighting assessment reported energy savings from&nbsp;<strong>27% in spaces illuminated 12 hours\/day, five days\/week<\/strong>&nbsp;to&nbsp;<strong>63% in a call center operating 18 hours\/day, seven days\/week<\/strong>, with payback below seven years for the call center. (<a href=\"https:\/\/www.gsa.gov\/governmentwide-initiatives\/federal-highperformance-buildings\/highperformance-building-clearinghouse\/completed-assessments\/lighting\/occupant-responsive-lighting?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">gsa.gov<\/a>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hours matter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Again.<\/p>\n\n\n\n<h2 id=\"low-hour-spaces-can-produce-weak-payback\" class=\"wp-block-heading\">Low-Hour Spaces Can Produce Weak Payback<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A storeroom used 300 hours per year?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Working fluorescent fixtures?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Premium LED + networked controls?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe not.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At least not for ROI alone.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do the ugly, high-hour zones first.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They tend to pay you back faster.<\/p>\n\n\n\n<h2 id=\"prioritize-the-retrofit-portfolio\" class=\"wp-block-heading\">Prioritize the Retrofit Portfolio<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A simple screen:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Annual Lighting Energy = Watts \u00d7 Quantity \u00d7 Hours<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Area A:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">20 kW \u00d7 6,000 h<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>120,000 kWh\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Area B:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">50 kW \u00d7 500 h<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">=&nbsp;<strong>25,000 kWh\/year<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Area B has more connected watts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Area A burns much more energy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s where I&#8217;d start.<\/p>\n\n\n\n<h2 id=\"utility-demand-charges-may-matter\" class=\"wp-block-heading\">Utility Demand Charges May Matter<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Some commercial tariffs include demand charges.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So reducing lighting load during the building&#8217;s actual peak can create extra value.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But only if it affects the billed peak.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check the tariff.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Don&#8217;t make up demand savings because the spreadsheet has a row for them.<\/p>\n\n\n\n<h2 id=\"reduced-hvac-load-can-be-included-carefully\" class=\"wp-block-heading\">Reduced HVAC Load Can Be Included Carefully<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Lighting watts become heat.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Reduce lighting power, cooling load may fall.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Makes sense.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But if the building is heating-dominated for part of the year, some of that benefit gets offset.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I wouldn&#8217;t guess.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the HVAC saving is small, ignore it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If it&#8217;s big, model it properly.<\/p>\n\n\n\n<h2 id=\"product-lifetime-must-match-the-analysis-period\" class=\"wp-block-heading\">Product Lifetime Must Match the Analysis Period<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fifteen-year ROI model.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Equipment realistically replaced after ten years.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You&#8217;ve got a missing cost.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And controls may need replacement sooner than luminaires.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Different components.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Different lives.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Put them in the model.<\/p>\n\n\n\n<h2 id=\"warranty-is-not-lifetime\" class=\"wp-block-heading\">Warranty Is Not Lifetime<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Five-year warranty isn&#8217;t:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201czero failures for five years.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It isn&#8217;t:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cfixture lasts exactly five years.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It&#8217;s a contractual commitment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lifetime is a reliability question.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Separate them.<\/p>\n\n\n\n<h2 id=\"supplier-quality-is-part-of-financial-risk\" class=\"wp-block-heading\">Supplier Quality Is Part of Financial Risk<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Your ROI calculation assumes production unit No. 4,000 behaves like the sample.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then the supplier changes the driver.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Or LED.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Or PCB.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Or connector.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now failure behavior changes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s why&nbsp;<a href=\"https:\/\/chineseledlight.com\/manufacturing-quality\/?utm_source=chatgpt.com\">SENLUX manufacturing and quality control<\/a>&nbsp;matters on larger retrofit programs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">BOM drift can become ROI drift.<\/p>\n\n\n\n<h2 id=\"cheap-fixtures-can-destroy-a-good-roi-model\" class=\"wp-block-heading\">Cheap Fixtures Can Destroy a Good ROI Model<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Projected failure:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3%.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Actual:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">12%.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Service calls explode.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Replacement stock rises.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Savings shrink.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The formula wasn&#8217;t wrong.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The product assumption was.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is exactly why I get uncomfortable when an ROI model has eight decimal places and no reliability sensitivity.<\/p>\n\n\n\n<h2 id=\"retrofit-compatibility-testing-is-cheap-insurance\" class=\"wp-block-heading\">Retrofit Compatibility Testing Is Cheap Insurance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ten thousand pieces?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Install 10 first.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe 20.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>fit<\/li>\n\n\n\n<li>wiring<\/li>\n\n\n\n<li>dimming<\/li>\n\n\n\n<li>emergency behavior<\/li>\n\n\n\n<li>controls<\/li>\n\n\n\n<li>flicker<\/li>\n\n\n\n<li>heat<\/li>\n\n\n\n<li>photometric result<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Pilot first.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mass production later.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not sexy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Works.<\/p>\n\n\n\n<h2 id=\"i-d-separate-roi-into-three-layers\" class=\"wp-block-heading\">I&#8217;d Separate ROI Into Three Layers<\/h2>\n\n\n\n<h3 id=\"layer-1-technical\" class=\"wp-block-heading\">Layer 1 \u2014 Technical<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Does it actually meet the lighting requirement?<\/p>\n\n\n\n<h3 id=\"layer-2-operational\" class=\"wp-block-heading\">Layer 2 \u2014 Operational<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Can people install, commission, maintain and replace it?<\/p>\n\n\n\n<h3 id=\"layer-3-financial\" class=\"wp-block-heading\">Layer 3 \u2014 Financial<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Do the resulting savings justify the investment?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If Layer 1 fails, the ROI doesn&#8217;t matter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If Layer 2 is ugly, Layer 3 may be wrong.<\/p>\n\n\n\n<h2 id=\"my-commercial-led-retrofit-roi-checklist\" class=\"wp-block-heading\">My Commercial LED Retrofit ROI Checklist<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before I trust the result, I want:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>actual baseline watts<\/li>\n\n\n\n<li>actual quantity<\/li>\n\n\n\n<li>credible annual hours<\/li>\n\n\n\n<li>current utility tariff<\/li>\n\n\n\n<li>proposed system watts<\/li>\n\n\n\n<li>photometric equivalence<\/li>\n\n\n\n<li>installation labor<\/li>\n\n\n\n<li>maintenance baseline<\/li>\n\n\n\n<li>replacement-event cost<\/li>\n\n\n\n<li>control savings methodology<\/li>\n\n\n\n<li>incentives<\/li>\n\n\n\n<li>failure assumptions<\/li>\n\n\n\n<li>evaluation period<\/li>\n\n\n\n<li>sensitivity analysis<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Then show me the payback.<\/p>\n\n\n\n<h2 id=\"faq\" class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n<h3 id=\"what-is-led-retrofit-roi\" class=\"wp-block-heading\">What is LED retrofit ROI?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>LED retrofit ROI is the percentage financial return generated by replacing an existing lighting system with LED technology after comparing the retrofit investment with accumulated energy, maintenance and other operating-cost savings over a defined period, allowing commercial buyers to judge whether the upgrade creates enough financial benefit to justify its cost.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Simple ROI can use nominal savings, while larger projects may benefit from discounted cash-flow analysis.<\/p>\n\n\n\n<h3 id=\"how-do-you-calculate-led-retrofit-roi\" class=\"wp-block-heading\">How do you calculate LED retrofit ROI?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Calculate LED retrofit ROI by estimating annual energy and maintenance savings, multiplying those savings by the chosen evaluation period, subtracting the net project investment and then dividing the remaining financial benefit by that investment, while more advanced models also include incentives, electricity escalation, replacement costs and discounted future cash flows.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But technical equivalence comes first. A cheaper retrofit that delivers inadequate illumination hasn&#8217;t created a valid financial comparison.<\/p>\n\n\n\n<h3 id=\"how-do-you-calculate-led-energy-savings\" class=\"wp-block-heading\">How do you calculate LED energy savings?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>LED energy savings are calculated by subtracting the proposed LED system wattage from the existing lighting wattage, multiplying the difference by fixture quantity and annual operating hours, dividing by 1,000 to obtain kilowatt-hours, and multiplying those saved kWh by the applicable electricity rate to estimate annual monetary savings.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If controls are modeled separately, don&#8217;t quietly count their savings twice.<\/p>\n\n\n\n<h3 id=\"what-is-a-good-payback-period-for-a-commercial-led-retrofit\" class=\"wp-block-heading\">What is a good payback period for a commercial LED retrofit?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A good commercial LED retrofit payback period depends on the organization&#8217;s capital requirements, operating hours, electricity prices, installation cost and risk tolerance, although shorter paybacks are generally more attractive because the initial investment is recovered sooner and the project has more remaining service life in which to generate net savings.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There isn&#8217;t a universal \u201cgood\u201d two-year or three-year threshold for every building.<\/p>\n\n\n\n<h3 id=\"how-do-maintenance-savings-affect-led-retrofit-roi\" class=\"wp-block-heading\">How do maintenance savings affect LED retrofit ROI?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Maintenance savings improve LED retrofit ROI by reducing the recurring cost of lamps, ballasts, drivers, technician labor, access equipment, disposal and service interruptions, which can be financially significant in high-ceiling, high-hour or difficult-access facilities where the labor and equipment required for one replacement can exceed the component cost itself.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Use the site&#8217;s actual maintenance history if you can get it.<\/p>\n\n\n\n<h3 id=\"should-rebates-be-included-in-led-retrofit-payback-calculations\" class=\"wp-block-heading\">Should rebates be included in LED retrofit payback calculations?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Rebates and incentives should be included when they are realistically available and the project satisfies the applicable program requirements, because they reduce the net initial investment and can materially shorten simple payback, but buyers should also calculate a no-incentive scenario in case program funding, eligibility or installation timing changes.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That second calculation costs nothing and exposes how rebate-dependent the business case really is.<\/p>\n\n\n\n<h3 id=\"do-lighting-controls-improve-led-retrofit-roi\" class=\"wp-block-heading\">Do lighting controls improve LED retrofit ROI?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Lighting controls can improve LED retrofit ROI by reducing effective operating hours or output through occupancy sensing, scheduling, task tuning and daylight response, but the incremental hardware and commissioning cost must be compared with the incremental energy savings because controls can produce strong returns in some buildings and weak returns in others.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">GSA&#8217;s 2024 field assessments documented both outcomes. (<a href=\"https:\/\/www.gsa.gov\/governmentwide-initiatives\/federal-highperformance-buildings\/highperformance-building-clearinghouse\/completed-assessments\/lighting\/led-fixtures-with-integrated-controls?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">gsa.gov<\/a>)<\/p>\n\n\n\n<h3 id=\"what-is-the-difference-between-led-retrofit-roi-and-payback\" class=\"wp-block-heading\">What is the difference between LED retrofit ROI and payback?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>LED retrofit payback measures how long cumulative savings take to recover the initial project investment, while ROI measures the financial gain relative to that investment over a specified period, meaning two projects can have similar payback periods but substantially different long-term profitability depending on equipment life and post-payback savings.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">NPV and life-cycle cost add another layer when the investment is large enough to justify a proper capital model.<\/p>\n\n\n\n<h3 id=\"what-information-is-needed-for-an-led-retrofit-payback-calculator\" class=\"wp-block-heading\">What information is needed for an LED retrofit payback calculator?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>An LED retrofit payback calculator needs existing and proposed system wattage, fixture quantity, annual operating hours, electricity rate, product and installation costs, expected maintenance expenses and available incentives, while more sophisticated calculators can also include lighting controls, failure assumptions, electricity escalation, discount rates and equipment replacement cycles.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bad inputs still produce bad answers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Even when the spreadsheet looks gorgeous.<\/p>\n\n\n\n<h2 id=\"the-retrofit-question-i-d-stop-asking\" class=\"wp-block-heading\">The Retrofit Question I&#8217;d Stop Asking<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cHow much energy does this LED save?\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">I&#8217;d ask:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u201cAfter installation, maintenance, controls, incentives and realistic operating assumptions are included, how much money does this retrofit return\u2014and what happens to that answer when our assumptions are wrong?\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s&nbsp;<strong>LED retrofit ROI<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">GSA&#8217;s 2024 research makes the point better than a marketing brochure ever could: one LED-and-controls application produced&nbsp;<strong>69% lighting-energy savings and 40% ROI<\/strong>, while another controls study achieved&nbsp;<strong>43% additional LED lighting-energy reduction but didn&#8217;t recover the incremental controls cost under that site&#8217;s economics<\/strong>. (<a href=\"https:\/\/www.gsa.gov\/governmentwide-initiatives\/federal-highperformance-buildings\/highperformance-building-clearinghouse\/completed-assessments\/lighting\/led-fixtures-with-integrated-controls?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">gsa.gov<\/a>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Same broad technology.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Different result.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And Berkeley&#8217;s 2023 public-safety retrofit used a different lever again\u2014grants, incentives and zero-interest financing structured so the monthly financing burden could remain at or below the energy savings. (<a href=\"https:\/\/integratedlightingcampaign.energy.gov\/2023-recognized-partner-city-berkeley?utm_source=chatgpt.com\" rel=\"nofollow noopener\" target=\"_blank\">integratedlightingcampaign.energy.gov<\/a>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So my preferred order is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>baseline \u2192 lighting requirement \u2192 proposed wattage \u2192 actual quantity \u2192 operating hours \u2192 electricity rate \u2192 maintenance \u2192 installation \u2192 incentives \u2192 controls \u2192 payback \u2192 ROI \u2192 sensitivity<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then negotiate fixture price.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you&#8217;re evaluating retrofit downlights, replacement modules, track lighting upgrades or large commercial LED conversions, SENLUX can help review product compatibility, photometric performance, fixture quantities, driver\/control requirements and project assumptions before mass ordering.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/chineseledlight.com\/retrofit\/?utm_source=chatgpt.com\">Explore SENLUX retrofit lighting products<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/chineseledlight.com\/project-support\/?utm_source=chatgpt.com\">Review SENLUX project support<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/chineseledlight.com\/contact\/?utm_source=chatgpt.com\">Contact SENLUX Lighting<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>LED retrofit ROI is not simply the percentage drop in wattage. This guide shows commercial buyers how to calculate annual energy savings, maintenance savings, project cost, incentives, simple payback and long-term ROI\u2014and why operating hours, controls, labor and fixture quantity can completely change the result.<\/p>","protected":false},"author":2,"featured_media":2357,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[16],"tags":[143,140,141,144,142],"class_list":["post-2356","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-project-performance-roi","tag-commercial-led-retrofit","tag-led-energy-savings","tag-led-retrofit-roi","tag-lighting-maintenance-savings","tag-lighting-payback-period"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/chineseledlight.com\/fr\/wp-json\/wp\/v2\/posts\/2356","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chineseledlight.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chineseledlight.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chineseledlight.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/chineseledlight.com\/fr\/wp-json\/wp\/v2\/comments?post=2356"}],"version-history":[{"count":1,"href":"https:\/\/chineseledlight.com\/fr\/wp-json\/wp\/v2\/posts\/2356\/revisions"}],"predecessor-version":[{"id":2360,"href":"https:\/\/chineseledlight.com\/fr\/wp-json\/wp\/v2\/posts\/2356\/revisions\/2360"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/chineseledlight.com\/fr\/wp-json\/wp\/v2\/media\/2357"}],"wp:attachment":[{"href":"https:\/\/chineseledlight.com\/fr\/wp-json\/wp\/v2\/media?parent=2356"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chineseledlight.com\/fr\/wp-json\/wp\/v2\/categories?post=2356"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chineseledlight.com\/fr\/wp-json\/wp\/v2\/tags?post=2356"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}