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Click calculate to find out the electricity cost of a single incandescent light bulb running at 60 Watts for 5 hours a day @ $0.10 per a kWh, keep in mind you can edit the numbers in the calculator. Cost Per Hour: Cost Per Day:ncandescent light bulbs have an average lifespan of 1000 hours or 41.6 days running 24/7. While comparable CFL light bulbs last an average of 9,000 hours or 375 days running 24/7 and an LED light bulb lasts 50,000 hours or 2,083 days.
Best Answer: 60 watt incandescent uses, guess what, 60 watts 60 watts x 720 hours/month = 43200 watt-hours / month = 43 kW-hrs /month. Look up your cost of power, I'll assume $0.10 per kW-hr 43 kW-hrs /month x $0.10 per kW-hr = $4.30 per month. you can multiply by 12 to get annual cost.This assumes the light bulb is on all the time.If it's on only 4 hours per day, divide those numbers by 24/4 or by 6. Source(s):billrussell42 Â· 7 years ago.ook up your cost of power, I'll assume $0.10 per kW-hr 43 kW-hrs /month x $0.10 per kW-hr = $4.30 per month. you can multiply by 12 to get annual cost. This assumes the light bulb is on all the time. If it's on only 4 hours per day, divide those numbers by 24/4 or by 6. Source(s): billrussell42 Â· 7 years ago.