Quote:
Originally Posted by brk-lnt
FYI, I like LED bulbs too, and have been using them with good results.
Some math...
Electricity around here is about 13 cents per kilowatt hour "all in" (meaning, factoring in taxes and all the other costs beyond the raw KwH cost).
A 60 watt bulb is ~1/16th of a kilowatt (duh!), so it costs 1/16th of 12 cents per hour to operate, or about .07 *cents* (less than 1 cent) per hour. Your payback on an LED bulb is about 10 years in normal use (figuring lifespan relative to replacing incandescent bulbs, and the power savings).
|
Hmmmm, lets review that again. (60-11)/60*.0007 is the savings per hour of using an 11 watt LED vs a 60 watt incandescent. Payback of the LED would be 10.95/( (60-11)/60*.0007 ) = 19155 hours or 798 days or
2 years+10 weeks.
This is assuming NB leaves his light on 24 hrs/day and does not include the added savings of replacing blowing incandescents.