Bioluminescence

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Bioluminescence is the production and emission of light by a living organism. It is a form of chemiluminescence. Bioluminescence occurs widely in marine vertebrates and invertebrates, as well as in some fungi, microorganisms including some bioluminescent bacteria and terrestrial invertebrates such as fireflies.

Bioluminescence is a "cold light." Cold light means less than 20% of the light generates thermal radiation, or heat.