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LED Energy Savings Calculator
Calculate annual kWh savings, cost reduction, and CO₂ impact when switching from fluorescent to LED tubes.
Your Facility Parameters
6205 kWh
Energy Saved / Year
$745
Cost Saved / Year
2.4 t
CO₂ Reduced / Year
53%
Wattage Reduction
How LED Energy Savings Are Calculated
Annual kWh savings = (Fluorescent wattage − LED wattage) ÷ 1,000 × Number of fixtures × Operating hours/day × 365. Replacing 32W T8 fluorescent with 15W LED saves 17W per fixture — a 53% reduction in lighting energy.
CO₂ savings use the EPA's average US grid emission factor of 0.386 kg CO₂ per kWh. For ASHRAE 90.1 compliance and Section 179D tax deductions, LED tube retrofits typically qualify when reducing lighting power density below 0.5 W/ft².
Frequently Asked Questions
How much energy do LED tubes save compared to fluorescent?
T8 LED tubes (15W–18W) use 40–55% less energy than equivalent T8 fluorescent tubes (32W–40W). T5 LED tubes (7W–14W) use 30–50% less than T5 fluorescent (14W–28W). The exact savings depend on the specific wattages of your existing fixtures.
What is the average electricity rate in the US?
The US average commercial electricity rate is approximately $0.12–$0.14/kWh (2024 EIA data). Industrial rates average $0.08–$0.10/kWh. Rates vary significantly by state — California averages $0.22/kWh while Texas averages $0.09/kWh.
Do LED tubes qualify for ASHRAE 90.1 compliance?
Yes. T8 LED tubes (15W–18W) achieve lighting power densities well below ASHRAE 90.1-2019 limits for most commercial space types (0.5–1.0 W/ft²). DLC Premium-listed tubes with ≥140 lm/W efficacy are recommended for maximum compliance margin.
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