Two things from Clouds link...
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Not all CFLs are manufactured to the same standards, so to get the best bulb, start by looking for an Energy Star label. Wilson says there’s a surprising variation in the bulbs’ lifetime, because the technology is simply more complicated than incandescent bulbs. In the Energy Star tests, a certain percentage of the bulbs must last a particular length of time. “It’s a pretty good assurance that you’re getting a good quality product,” he says.
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So don't shop price alone or you could get screwed in the end.
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“Consumers should know that the mercury in CFLs is not going to be detrimental to them in their home,” Reed says. “But it’s important to responsibly dispose of them, as you would any product that contains mercury — batteries, old thermometers and thermostats.”
Wilson has reached the same conclusion: “The take-home message is that when fluorescents have ceased to work properly, they shouldn’t just be thrown in the trash; you should dispose of them through your local solid waste agency.”
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So if everybody changes to CFLs it's good... as long as you follow through with proper disposal.