Cost Comparison

Incandescent vs. Compact Fluorescent Bulbs

Bulb Type 100 W Incandescent 23 W Compact Fluorescent
Purchase Price $0.75 $11.00
Life of Bulb 750 Hours 10,000 Hours
Number of Hours Burned Per Day 4 hours 4 hours
Number of Bulbs Needed About 6 over 3 years 1 over 6.8 years
Total Cost of Bulbs $4.50 $11.00
Lumens Produced 1,690 1,500
Total Cost of Electricity
(8 centers/kilowatt-hour)
$35.04 $8.06
Your Total Cost Over 3 Years $39.54 $19.06
Total Savings Over 3 three years with the Compact Fluorescent   $19.06
Source: U.S. Department of Energy, Energy Information Administration