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The things in nature that come closest are animals that exhibit bioluminescence, such as the glow worm or lighting bug, and some deep sea fishes. Scientists have been studying lightning bugs for years to learn the secrets of how they produce light without heat, in the hope that the process might be adapted for lighting for human use. Of man-made objects, luminescent phosphors, such as those used on watch dials, come close, as do electroluminescent panels, such as the backlights in Timex "Indiglo" watches.

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13y ago
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11y ago

Fireflies are the insects that produce light with no heat. Hence, called cold light.

Also called Biolumuniscence.

The order coleoptera has a family Lampyridae which includes winged beetles that are commonly called fireflies or lightning bugs.

There are nearly 2000 species of fireflies distributed in tropical and temperate environments of world.

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Q: What gives of light but does not give out heat?
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