How long do LED bulbs last?

LED bulbs typically last 25,000-50,000 hours compared to 1,000 hours for incandescents and 8,000-10,000 for CFLs. At 5 hours/day, an LED lasts 13-27 years.

Are LEDs worth the higher upfront cost?

Yes. LED bulbs cost $2-5 each and save $5-10 per year per bulb in electricity. They pay for themselves in a few months and last years longer.

Do LEDs work with dimmer switches?

Most LEDs are dimmable, but you need to check the label. Dimmable LEDs require compatible dimmer switches designed for LED loads.

LED Savings Calculator

Calculate annual energy and cost savings from switching incandescent or CFL bulbs to LED lighting.

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Number of Bulbs to Replace

Old Bulb Wattage

watts

LED Replacement Wattage

watts

Hours Used per Day

hours

Electricity Rate

USD/kWh

Annual Savings

279.22 USD

Energy Saved per Year1,862 kWh

CO2 Saved per Year0.78 metric tons

Energy Reduction85 %

Annual Savings vs Electricity Rate

View formula & how it works →

How to Calculate LED Savings

LEDs use 75-85% less energy than incandescent bulbs and 30-40% less than CFLs while lasting much longer.

Formula

Energy Saved = Bulbs * (Old Watts - LED Watts) * Hours/Day * 365 / 1,000

Cost Saved = Energy Saved * Rate per kWh

Typical Equivalents

60W incandescent = 9W LED

100W incandescent = 15W LED

150W incandescent = 23W LED

Example Calculation

Replace 20 incandescent 60W bulbs with 9W LEDs, used 5 hours/day at $0.15/kWh.

01Old annual kWh: 20 * 60 * 5 * 365 / 1,000 = 2,190 kWh
02LED annual kWh: 20 * 9 * 5 * 365 / 1,000 = 328.5 kWh
03Energy saved: 2,190 - 328.5 = 1,861.5 kWh
04Annual savings: 1,861.5 * $0.15 = $279.23

LED Savings Calculator

How to Calculate LED Savings

Formula

Typical Equivalents

Example Calculation

Frequently Asked Questions

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