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A black light, also referred to as a UV-A light, Wood's light, or simply ultraviolet light, is a lamp that emits long wave (UV-A) ultraviolet light and not much visible light. The lamp has a violet filter material, either on the bulb or in a separate glass filter in the lamp housing, which blocks most visible light and allows through UV, so the lamp has a dim violet glow when operating.

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  • A black light, also referred to as a UV-A light, Wood's light, or simply ultraviolet light, is a lamp that emits long wave (UV-A) ultraviolet light and not much visible light. The lamp has a violet filter material, either on the bulb or in a separate glass filter in the lamp housing, which blocks most visible light and allows through UV, so the lamp has a dim violet glow when operating.
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