Posted by Leroy on October 04, 2016 at 10:48:12 from (69.88.202.2):
My math is not good enough to figure this out. On the electric bill I figure out that it is costing at about .11 9/10 cent per killowatt. What I do not know how to go from there is to figure out what it costs to operate each of these bulbs for a 24 hour period. 100W incandesecant, 23W CFL, 13W Cfl or 14.5W LED or 9W led or a 7W night light. What formula do I need to figure this out? Just bought some LED 9 Watt and 14.5 watt. Going to try to see if the LED lights up faster in the cold than the CFL or as fast as the incandesicant. And just wondering what it is costing me to leave on that night light or the 13W CFL full time. The others are only as needed. Does not look like much difference if I would switch the 13W CFL to a 9W LED left on in kitchen-living room full time. I have had the LED night lights and they do not make enough light for me to see at night to get to bathroom.
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