Comparison Incandescent vs. Fluorescent Light Bulbs 100 Watts Incandescent light bulb23 Watts Compact Fluorescent Number of Sockets 25 Burned per Day (hr) 4 Electricity Tax Rate: 11.20% Price per Killo Watts: $0.10 # of Bulbs Needed 2 bulbs per year 1 bulb per 7 years Purchase Price: $0.75 $11 Maintenance Cost: $37.50 per year $275 per 7 years Useful Life: 750 hrs 10,000 hrs Lumens Produced: 1690 1500 Source: U.S. Department of Energy, Energy Information Administration
Operating Cost Incandescent Light Energy cost: $365 per year 2 bulbs needed a year per socket Maintenance cost: $37.50 Total cost: $443.38
Operating Cost cont. Fluorescent Light Energy cost: $83.95 per year 1 bulb needed over 7 years per socket Maintenance cost: $275 Total cost: $368.35
Present Worth Cost Replacement cost Energy cost Operating cost Over a span of 6 years Discount rate: 3%
Total Present Worth of Cost 100W Incandescent light bulb $3,316.47 23W Fluorescent light bulb $729.77 ∆PWC value $2586.70
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