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Originally Posted by gafftaper
Yeah Footer wrong end of the spectrum buddy... get some rest. "Wood's glass" is a filter that allows UV to pass while blocking visible light. While a "cold mirror" allows IR to pass while blocking visible light (it's what they use in Selecons to cool the light down). But as he said there's a big difference. It takes a TON of incandescent light source to generate a small amount of UV. Where it only takes a small incandescent source to create a lot of IR. As we've all heard lately in the news, Incandescence is really inefficient and ton's of excess heat is wasted in the production of light. Gaseous discharge lamps on the other hand are much more efficient and are sort of tuned to a specific wave length. So it's easy to produce a ton of UV with a discharge lamp while it's harder to produce IR.
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My understanding is that the "cold mirror" technology is in source fours as well.