Light is electromagnetic radiation that is detectable to the eye. Occasionally, the term "light" was used to refer to electromagnetic radiation in general. A quantitative unit of light is the photon.
The distance that light travels in one year was a unit of measurement for starship navigation and the speed that light travels was a unit of measurement for starship velocity.
Some cloaking and holographic technologies operated by manipulating light in some fashion. (ENT: "In a Mirror, Darkly"; VOY: "Phage", "Repentance")
Light could be created from a variety of different sources including light bulbs, fires, candles, and stars.
"Sunlight" or "daylight" was also a common term referring to light. (TNG: "Home Soil"; ENT: "The Catwalk")
The Robbiani dermal-optic test measured one's reactions to various color wavelengths. (TOS: "Turnabout Intruder")
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