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The frequency of some flourescent bulbs affects the moods of people who receive little natural light. Graveyard shift anyone? Incandesent bulbs are also usefull for keeping spaces heated so your water pipes don't freeze in the rare, shortlived cold spells. I don't want or need the extra mercury, but I am replacing the incandecents, when they burn out, with flourescents. I am waiting for the LED technology to arrive.
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