The International System unit of illumination, equal to one lumen per square meter. See Table at measurement.
from The American Heritage Dictionary of the English Language, 4th Edition
A unit of illumination equal to the direct illumination on a surface that is everywhere one meter from a uniform point source of one candle intensity or equal to one lumen per square meter.
from Free Scrabble Dictionary
The SI unit of illuminance, equal to one lumen per square metre.
from Free Scrabble Dictionary
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