Quote:
Originally Posted by Servicetech
30W per fixture savings x 3 fixtures = 90W. If you pay 10 cents per KWH you need to save 100KWH to save $10. 100KWH/90W savings = 1,111 hours per month. Problem is there are only 720hrs in a month.
The bigger thing that determines payback time is how much the mod costs. At retail prices the value isn't there. If you can buy the items at substantial discount then payback times are a lot shorter.
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There are two things you might need to change in your calculations: The way that I read it was that he replaced 75w*3 = 225W with a total usage of 45W? Also, CA power is closer to 19-20c per KWH.