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Why aren't black lights black?

Updated: 6/15/2024
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13y ago

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Black as a color would absorb all visible frequencies of light.

A "black light" is not actually black, but rather emits most of its light in the ultraviolet frequencies. This light is invisible to our eyes except that it interacts with certain materials that fluoresce (glow in the dark) when they absorb UV light. These lights are also used for indoor plants that need UV light to grow.

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13y ago
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3w ago

Black lights emit ultraviolet light that is not visible to the human eye. The light produced by black lights is actually a deep purple color, but because it is outside the visible spectrum for most people, it appears black.

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Do black lights use more electricity than regular bulbs?

Black lights typically use the same amount of electricity as regular bulbs of the same wattage. The difference is in the type of light they emit: black lights emit ultraviolet (UV) light, which is not visible to the human eye but can make certain materials glow.


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