Great short article on the different Luciferases found in organisms. Makes me wonder if there are Luciferases that act beneath the visible spectrum emitting light that insects may pick up that we can not.

http://actanaturae.ru/2075-8251/article/view/11152

A high level look at what spectrum different organisms produce light in and their associated Luciferase enzyme size:

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A more detailed look at the mechanism of light production for each of these Luciferases: