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Because its at the blue end of the light spectrum, visual light is in the middle (what we can see) and infra red is at the other (red end) of the spectrum. Does it appear blue? To whom? Or to what? Is ultraviolet and infrared light part of the visible spectrum? If not, then we don't know what they appear to be. A UV light source appears blue because the light waves it produces go down into the blue/indigo/violet frequency range. You can't see the ultraviolet light itself, just this "waste" light. There are two reasons they don't tune UV sources to just generate UV--it would be really expensive to build a bulb like that, and they want you to see the bulb's on so you won't look at it and harm your eyes.

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17y ago

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