Spectrum

a spectrum is a pattern of light. the electromagnetic spectrum consists of visible light, ultraviolet light, infrared light, gamma rays, x-rays, and many other types of light. different species are sensitive to different spectrums of light. Humans and Ithorians are just two examples of species who see visible light, however, Umbarans and Defel are sensitive to ultraviolet light. some species, such as Kaminoans can see in multiple spectrums, however, only see color in one. for Kaminoans, they see color in ultraviolet.

sources: Star Wars Episode II, Attack of the Clones Visual Dictionary.