The eternal light question

[willard3]

Originally Posted by GpsFrontier

. But let say to make the math easy, you have a florescent light that puts out 10,000 lumens at 100 watts. 10,000 divided by 100= 100. Is that 100 kilowatts? Is that per minute, per hour? Also how would you figure out the energy consumption for appliances that don't put out light (lumens)?

If you divide lumens by watts, how would you come out with kilowatts?
Watts/1000 = kilowatts
(Lamp watts/1000) X hours of operation = kilowatt hours
KWH X cost/kwh = cost