Bioluminescence
Bioluminescence is the production and emission of light by a living organism. It is a form of chem

iluminescence. 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.