light bulbs
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Umbra on mercury in CFLs
Dearest Umbra, For the past 10 years or so I have been patiently and methodically replacing the incandescent light bulbs in my house with the more efficient compact fluorescent ones. Even though they cost more than incandescents, I have been confident that their lower energy requirements and longer life span more than made up for […]
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Umbra on replacing light bulbs
Dear Umbra, I am reluctant to switch to compact fluorescent light bulbs because that means tossing out not only used-but-still-working incandescent bulbs, but also the brand-new bulbs I have waiting in the closet. Is it really a positive effect overall when we’re reducing our carbon emissions but adding to landfills? Julie Pittsburgh, Pa. Dearest Julie, […]
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Umbra on smelly CFLs (and mercury too)
Dear Umbra, We have been replacing our incandescent light bulbs with compact fluorescent bulbs, but we notice that the compact fluorescents have an odd smell. Are they emitting something we should know about? Compact fluorescent bulbs contain mercury; can the bulbs discharge the mercury into the air? Tom MurphyWellsboro, Pa. Dearest Tom, I don’t know […]
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Umbra on CFLs and dimmers
Dearest Umbra, Are there compact fluorescent bulbs for lights on dimmer switches? Why can’t I use regular CFLs in dimmers? Dimly, Julia L. Ottawa, Ontario, Canada Dearest Julia, I feel like my brain is squinting when I try to understand electrical current and wiring, but here we go: the short answer is yes, there are […]