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A 12V hair dryer is reasonably quite (much less than a 240V one - although you probably hear a 240V one in a bathroom rather than in the open air).
Mine draws about 10amps - so about 120W of heating. I don't know how anyone could actually dry their hair with one though - the heat output is pretty pathetic. However, it's more than enough to sort out the dew on the corrector plate of my SCT. Remember you don't really want to cook the optics, just warm them above the dew point. Too much heat too quickly could cause something to go bang!
A 240V hair dryer is probably 500-1000W.
David T
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