the basic unit of luminance in the CGS system, equal to the brightness of an ideal surface that radiates or reflects light at the rate of one lumen per square centimeter (929.023 foot-candles
or 10,000 lux or 1/π candela per square centimeter)abbrev. L
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'lambert'after J. H. Lambert (1728-77), Ger mathematician, physicist, & philosopher