Emitting light without appreciable heat as by slow oxidation of phosphorous.

Roget 420: shining etc. v.; luminous, luminiferous^†; lucid, lucent, luculent^†, lucific^†, luciferous; light, lightsome; bright, vivid, splendent^†, nitid^†, lustrous, shiny, beamy^†, scintillant^†, radiant, lambent; sheen, sheeny; glossy, burnished, glassy, sunny, orient, meridian; noonday, tide; cloudless, clear; unclouded, unobscured^†.    gairish^†, garish; resplendent, transplendent^†; refulgent, effulgent; fulgid^†, fulgent^†; relucent^†, splendid, blazing, in a blaze, ablaze, rutilant^†, meteoric, phosphorescent; aglow.    bright as silver; light as day, bright as day, light as noonday, bright as noonday, bright as the sun at noonday.    actinic; photogenic, graphic; heliographic; heliophagous^†.    ... show more

Roget 423: self-luminous, glowing; phosphoric^†, phosphorescent, fluorescent; incandescent; luminescent, chemiluminescent; radiant etc. (light) 420.