Have you seen Purple/UV Street Lights around you?
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Humans can't see UV but your eyes can be damaged by it.
For LEDs putting out UV, we can also see nearby wavelengths which get pumped out too, so seeing purple in this LED case means there is some UV.
A conclusive test is when dyes that are daylight fluorescent are glowing in a light source, it is putting out UV. Another test is that many washing detergents have brighteners in them, and if your shirt glows a bit bluish under a purple streetlight, that is a sign the detergent residue is reacting to UV hence there IS UV.
Yes. White light LEDs use the same principle as fluorescent tubes; all fluorescent tubes are UV emitters inside and white phosphor outside.
The white light phosphor for LEDs can vary in emitted wavelengths by using slightly different compounds plus dye filters, but all the phosphors put out narrow bands unlike tungsten incandescents; hot tungsten puts out a broad spectrum somewhat like nature sunlight which our eyes like. LEDs suck due to the narrow wavelength range output.
UV LEDs are bad for eye health and they will damage the cornea and lens. Anyone working where these are used will get cataracts earlier in life. Beware.