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They emit infrared light waves. Which is a non-visible light.
Commonly used to provide light for infrared security cameras when there in little to no light visible light Also used in bathroom heat lamps to transmit the heat waves to your skin I believe (not sure) infrared is lower frequency than visible light and ultraviolet is higher frequency than visible light

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16y ago
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15y ago

Much like red light, but lower in frequency. Air is not quite as transparent to IR as to visible light, on the other hand warm blooded, living things glow in IR.

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Q: What are a characteristics of infared radiation?
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