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Most every light delivers some quantity of uva and uvb light. Some more than others. Black lights, as they are called deliver a much larger quantity of uva, uvb, and uvc than ordinary fluorescent bulbs. The reason? Every light you see that's fluorescent produces 100% Ultraviolet light. The reason you see visible light is due to the white powder the coat the inside of the glass tube with. That powder acts as a filter that converts the ultra violet light into the visible spectrum Black lights simply forgo using this powder and opt for another. One that doesn't convert the ultraviolet.

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