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Most recreational blacklights (not for identification of rocks/minerals or for sterilization) emit UV-A light, in the 345nM to 400nM spectrum, this is safe to use continuously as long as the light or a reflection of the light is not directly in your field of view. Keep a distance of a few feet between yourself and the light to prevent the small amounts of skin damage that can occur from intense concentrations of UV-A.
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