I've tried a fair number of CFLs over the years and so far my favorite is the Ott brand. It's a little more than the others but it feels the closest to daylight to me. Lowe's has a brand called Bright Effects that's less but also quite nice. Probably the worst I've had is Ikea. Cheap but they don't last, the light is weak, and I don't like the color. Even though the mercury in them is a very small amount, I would like to avoid disposing of them for as long as possible and if I need more to get the same lumens, that's also a bit less green.
I try to be green but one thing I didn't realize when I bought my house, though, was that many of the fixtures were halogen. It never occurred to me to check. I could clearly see that one was but there was a fan and several ceiling fixtures that surprised me. It's a beautiful light and I've seen some arguments that it's fairly efficient but I've never gotten a full answer on that. They're closed fixtures so I guess I couldn't use CFLs there anyway. I may swap them out when LED bulbs become less prohibitively priced.
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