The usual distinction between "light" and "non-light" is based on the underlying mechanism by which photons are being produced. Photons produced by electrons ju

The usual distinction between "light" and "non-light" is based on the underlying mechanism by which photons are being produced. Photons produced by electrons jumping between energy shells are what we call "light". By that definition, UV and infrared are "light". Light that's outside of the visible range for our eyes, but still potentially visible to other camera sensors (and some other animals). X-rays are not "light" because they're emitted by the atomic nucleus itself, rather than by electrons changing orbitals. Radio waves are not "light" because they're created by macroscopic-scale movement of electrons back and forth in free space.