Here is a small description of what a firefly can do:
The firefly is capable of producing a "cold light" containing no ultra violet rays, with a wavelength from 0.00051 to 0.00067 millimeters in length, pale yellowish or reddish green in color, with a light efficiency of 96%. The ordinary incandescent light has an efficiency of roughly 10%, most of the energy being wasted as heat.
Fireflies and lightning bugs are neither flies nor bugs, but beetles. Because of the luminous organ at the tip of the abdomen, fireflies are some of the most familiar, and surprisingly well-liked (or should I say less-feared?) insects. It is a sad childhood, indeed, that does not contain a summer evening or two spent chasing and capturing these charming little fellows. But wait! This species pictured below is a fearful predator of other firefly species, even going so far as to mimic their flashing pattern to lure unsuspecting males to their deaths!
But, I can't seem to come up with a tag line for you. Maybe others can?