7700 angstrom units propagated at a speed of about 186,300 miles per second, and including a similar form of radiant energy that does not affect the retina, as ultraviolet or infrared rays, a gleam or sparkle, as in the eyes...
Electromagnetic radiation with wavelengths capable of causing the sensation of vision, ranging approximately from 4000 (extreme violet) to (extreme red), 7700 angstroms...
a nice place to live
