How much does it cost to run a normal 100W light bulb? Per hour and the whole life of the bulb (please specify the life span you are using).
How much does it cost to run a 25W (equivalent to 100W of a normal bulb) energy saving light bulb? Per hour and the whole life of the bulb (please specify the life span you are using).
Please use the rate of 9.8 cents/Kw-hour.
If you have any other ways to compare these two bulbs in terms of money, please do share.
2 comments
If you must do the calculations, use the average life in hours divided by 1,000 multiplied by the stated wattage times $.098
100 watt will use .98 or 98% of a penny or $00.098 each hour
25 watt will use .25 or 25% of a penny or $00.025 each hour
no bulb lasts as long as the life is, so comparison is a guess
say each bulb lasts 6000 hours one costs 40 cents, the other costs $2.50
100 watts = .098 x 6000 = $58.8 25watts = .025 x 6000 = $15.0