what is luminous
luminous. adj. 1. radiating or reflecting light; shining; glowing: luminous colours. 2. (not in technical use) exhibiting luminescence: luminous paint. 3. full of light; well-lit. 4. (General Physics) (of a physical quantity in photometry) evaluated according to the visual sensation produced in an observer rather than by absolute energy measurements Compare radiant: luminous flux; luminous intensity.