incandescent light bulb cost per bulb
Part I: The Cost of an Incandescent Bulb. An incandescent light bulb costs about 50 cents and lasts about 750 hours. If you were to leave a 100-watt bulb burning for 24 hours each day, 365 days per year, it would use 876 kilowatt hours per year.(1000 watts equals one kilowatt â âkiloâ means a thousand.).he cost of a kilowatt-hour of electricity varies across the country, but average cost (including all charges) is about 15 cents. Your light bulb therefore costs about $32.40 per year to operate (216 kWh X 15 cents).