Then you can save even more money in electricity with a thrifty bulb. Indeed, if you are not offended by the light quality, warm up time, toxic hazards, or buzzing from CFLs (I am offended), then at 10 hours per day, you can save a bundle with the most efficient bulbs.
Looking at the math above that I laid out, the electricity cost of a bulb is going form most of the costs. So, when your friendly neighborhood economist (me) runs the numbers, I find that driving down the cost of electricity (while providing the quality and quantity of light you need) is the key.
Check the listing of math I showed above, and run your own numbers with a variety of bulbs. I’m all in favor of flat-out saving money. I don’t much care what technology is involved, so long as it does what I want (brightness, silence, light color, immediacy, etc.) After it meets my criteria for doing what I want it to do, then all I care about is total cost of ownership, including both bulbs (expensive or cheap) and electricity (lots or a little).
That’s conservatism, (and by happenstance, conservationism), not eco-wackoism.
For example, when we go on vacation, we leave on the ALGore 23 watt eco-wacko bulb. It is so darned cheap to run, that if you want to leave a light on for effect, but not actually use it (’cause its light sucks), then use the curlique bulb!