Luciferin

I am not talking about Lucifer, the devil. Although Luciferin does sound a lot like Lucifer itself. But no, the term luciferin means that Luciferin reacts with oxygen to produce light, 
and luciferase speeds up the reaction. 
The reaction may also include adenosine triphosphate (ATP). 
Most marine organisms emit light in the blue and green part of the spectrum, wavelengths that easily move through seawater.
 Back on land, the lightning bug emits light in the pale yellow to reddish green part of the spectrum.
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