I recall reading it in a general piece on the conversion from
incandescents, and the bulbs themselves don't feel cold and glass like
in the way incandescents did.
And really, why would you use glass when you can use a polymer?
More on CFLs
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CFLs are lauded by environmentalists because they require far less
electrical power than their incandescent counterparts. A 26-watt CFL
bulb produces the same lumens as a 100-watt incandescent bulb.
Assuming that you keep one of those bulbs aglow for six hours a day,
switching to a CFL will save you 126 kilowatt-hours of electricity per
year, which translates to 170 pounds of carbon dioxide emissions on
average. Now, how many bulbs do you have in your house? Twenty?
Thirty? Replace them all and you could conceivably (assuming six-hour-
a-day use throughout the building) reduce your annual CO2 output by
upward of 2.3 metric tons—about 10 percent of the average American
household's annual carbon footprint.
...
The irony of CFLs is that they actually reduce overall mercury
emissions in the long run. Despite recent improvements in the
industry's technology, the burning of coal to produce electricity
emits roughly 0.023 milligrams of mercury per kilowatt-hour. Over a
year, then, using a 26-watt CFL in the average American home (where
half of the electricity comes from coal) will result in the emission
of 0.66 milligrams of mercury. For 100-watt incandescent bulbs, which
produce the identical amount of light, the figure is 2.52 milligrams.
Ah, but what if your CFL bulb shatters? First off, don't panic: Unless
you plan on picking up the glass with bare hands and then licking it,
you're almost certainly safe from harm.
Even a broken CFL bulb won't leak too much toxic metal. According to
the EPA, just 6.8 percent of the mercury in a CFL bulb—that's at most
0.34 milligrams—is released if it shatters. OSHA's permissible
exposure limit for mercury vapor in the workplace is 0.1 milligrams
per cubic meter, so you'd have to break that bulb in an extremely
cramped space for there to be an appreciable hazard.
http://www.slate.com/id/2183606/pagenum/all/#page_
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Fran