How to Calculate LED Tube Retrofit ROI
A step-by-step guide for facility managers and electrical contractors to calculate energy savings, utility rebates, and payback period.
Replacing T8 fluorescent tubes with LED equivalents is one of the highest-ROI energy efficiency investments available to commercial facility managers. A typical 4ft T8 fluorescent draws 32W; its LED replacement draws 15W — a 53% energy reduction per fixture.
But the real ROI calculation requires accounting for utility rebates, maintenance savings, and lamp replacement costs. This guide walks through each factor with a live calculator.
LED Retrofit ROI Calculator
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The 4-Step ROI Calculation
Calculate Annual Energy Savings
Energy savings = (Fluorescent wattage − LED wattage) ÷ 1,000 × Number of fixtures × Operating hours/day × 365 days × $/kWh. A 100-fixture facility running 10 hours/day at $0.12/kWh saves approximately $1,226/year switching from 32W fluorescent to 15W LED.
Add Utility Rebates
DLC QPL-listed LED tubes qualify for utility rebates ranging from $5 to $30 per fixture depending on your utility provider and state. Use the DLC QPL Database at designlights.org to verify eligibility. Rebates can reduce payback period by 30–50%.
Factor in Maintenance Savings
T8 fluorescent tubes require replacement every 15,000–20,000 hours. LED tubes last 50,000+ hours — 2.5–3x longer. For a 100-fixture facility, this eliminates 2–3 replacement cycles over the LED lifespan, saving $200–$600 in labor and materials.
Calculate Total Payback Period
Payback period = (Total LED cost − Rebates) ÷ (Annual energy savings + Annual maintenance savings). Most commercial retrofits achieve payback in 1.5–3 years, with a 10-year NPV of 3–5x the initial investment.
Verify & Calculate with Official Tools
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