Bioluminescence is the emission of light by living creatures. This occurs when there is a chemical reaction inside of the bug and the energy is released as light. The type of light that occurs In Bioluminescence is a special type of light called cold light in which less than 20% of the light actually generates heat. This is the opposite of tipical light bulbs which use incandescent light which is a process where the bulb gets very hot and then emits light. The best pay off of luminescence is that it does not generate a lot fo heat nor does it require heat thus the name cold light. The bug does retain the 20% of heat that is created which is why the bug may seem hot but it would be improable that a bug every create enough energy to combust through cold light.
http://en.wikipedia.org/wiki/Bioluminescence
http://science.howstuffworks.com/environmental/life/zoology/all-about-animals/bioluminescence2.htm
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