| Yes, plenty of enclosed CFLs work outside in the winter. If you live in | an area of extreme cold, there's always HID. A 39W metal halide lamp | produces much more light than a 150W incandescent, and lasts 6-10 times | as long. I use exclusively CFLs in all my outdoor fixtures, it only gets | down to about 15F at the lowest here, so the plain exposed spiral type | work fine. Since these are on from dusk till dawn, the savings are | substantial and I get 2+ years out of a bulb. Even the vilified mercury | vapor lamp so common in yard lights and street lighting of the past is | more than twice as efficient as incandescent.
But none of them produce the quality of light that incandescent does, which is needed is _some_ places.