luminous
/ˈlü-mə-nəs/
adjective
emitting or reflecting usually steady, suffused, or glowing light
of or relating to light or to luminous flux
bathed in or exposed to steady light
luminous objects—the nebula, the stars, the planets
bright brilliant radiant luminous lustrous mean shining or glowing with light. bright implies emitting or reflecting a high degree of light. brilliant implies intense often sparkling brightness. radiant stresses the emission or seeming emission of rays of light. luminous implies emission of steady, suffused, glowing light by reflection or in surrounding darkness. lustrous stresses an even, rich light from a surface that reflects brightly without glittering.
noun
energy transferred in the form of visible radiation
noun
radiant flux in the visible-wavelength range usually expressed in lumens instead of watts