![]() It is the hypothetical source of/evidence for its existence is provided by: Sanskrit rocate "shines " Armenian lois "light," lusin "moon " Greek leukos "bright, shining, white " Latin lucere "to shine," lux "light," lucidus "clear " Old Church Slavonic luci "light " Lithuanian laukas "pale " Welsh llug "gleam, glimmer " Old Irish loche "lightning," luchair "brightness " Hittite lukezi "is bright " Old English leht, leoht "light, daylight spiritual illumination," German Licht, Gothic liuhaĆ¾ "light. ![]() " lucent lucid Lucifer luciferase luciferous lucifugous lucubrate lucubration luculent lumen Luminal luminary luminate luminescence luminous luna lunacy lunar Lunarian lunate lunation lunatic lune lunette luni- luster lustrum lux pellucid sublunary translucent. ![]() Also in late Old English 'a highly luminous color devoid of chroma.'. The lumen (symbol: lm) is the SI derived unit of luminous flux. of light, 'not bright, faintly luminous,' from early 14c. bright full of light shining strongly (of colors) strong and easy to see: a bright yellow dress brilliant very bright: The sky was a brilliant blue. Presented or perceived clearly or vividly: luminous memories. Having a high degree of saturation: a luminous green. Reflecting light illuminated: 'He watched a luminous cloud drifting up from the Gulf' (Tim Gautreaux). brilliant vivid vibrant These words all describe things that are shining or full of light or colors that are strong and easy to see. Emitting light, especially in the dark shining. The lumen is the standard unit of luminous flux. 2 very bright in color They painted the door a luminous green. Lumens are denoted by lm are a measure of the total amount of visible light to the human eye from a light source or lamp. It forms all or part of: allumette elucidate illumination illustration lea leukemia leuko- light (n.) "brightness, radiant energy " lightning limn link (n.2) "torch of pitch, tow, etc. Luminous flux is the quantity of the energy of the light emitted per second in all directions. During the winter holidays, with all their emphasis on light, you can see luminous displays of candles everywhere. Proto-Indo-European root meaning "light, brightness." Luminous means full of or giving off light.
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