Pronunciation: (luks), [key]
—pl. lu•cesPronunciation: (lOO'sēz). [key] Optics.
a unit of illumination, equivalent to 0.0929 foot-candle and equal to the illumination produced by luminous flux of one lumen falling perpendicularly on a surface one meter square. Symbol: lx Also called meter-candle.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.