Sacramento uses a multiple tier electricity rate, so, since we are always in the second tier, I used that rate - that number isn't fudged at all. And, I actually have replaced my bulbs in the PC fixture at about one year, because I was disappointed with the bulbs I was using, so I'm not sure that my once a year number was fudged that much. Some folks do it more often. Then there is the intangible "cost benefit" from using less electricity and helping to stop global warming. Plus, as I said, this is a hobby, something to do for fun, and much of the fun I get from the hobby is making new things for my setup, trying them out, and trying to quantify the performance of them. I don't do this as a business.
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