From what I understand, power production from coal has mercury as a by product, on a greater scale than the amount that goes into CFL bulbs. This could be seen as a reduction, or not a trade at all, depending where the numbers fall. Kind of like the argument that hybrids aren't any better than normal cars due to what goes into creating the batteries and using coal power to charge them.
I will say that fixtures with only one socket are the worst for CFLs because the light quality is both low, and poor. My mother in law has a single CFL in a fixture on a tall ceiling and I want to tear my eyes out when I'm over there because it's like being in a cave. She won't let me change the bulb either.



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