From Latin 'lumen' (light), from PIE *lewk- — things that emit or reflect light, or figuratively, intellectual brilliance.
Emitting or reflecting light, especially in the dark; bright, shining. Figuratively: intellectually brilliant or enlightening.
From Latin 'lūminōsus' (full of light, brilliantly lit, shining), from 'lūmen' (light, an opening that admits light — a window, a lamp-flame), from the root 'lūcēre' (to shine, to be bright), ultimately from Proto-Indo-European *lewk- (light, brightness, white, to see). The PIE root *lewk- is among the most widely attested in the language family. It produced Latin 'lūx' (light — genitive 'lūcis'), from which English has 'lucid' (clear, bright), 'translucent
The scientific unit 'lumen' — used to measure the total quantity of visible light emitted by a source — takes its name directly from the Latin word for light. When you buy a light bulb rated at 800 lumens, you are purchasing 800 units of 'light' in the most literal etymological sense. The older unit 'candlepower' has been replaced by this Latin ghost
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