lux

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lux

the derived SI unit of illumination equal to a luminous flux of 1 lumen per square metre. 1 lux is equivalent to 0.0929 foot-candle.
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Lux

Lumens measured by the square yard or meter.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

LUX

a unit of illumination in the International System of Units. Symbols, Ik (Russian) and Ix (international). One lux is the illumination on a surface area of 1 sq m when the incident luminous flux of the radiation on it is equal to 1 lumen (1m); 1 Ix = 10-4 phot (the unit of illumination in the cgs system of units).

lux

[ləks]
(optics)
A unit of illumination, equal to the illumination on a surface 1 square meter in area on which there is a luminous flux of 1 lumen uniformly distributed, or the illumination on a surface all points of which are at a distance of 1 meter from a uniform point source of 1 candela. Symbolized lx. Also known as meter-candle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

lux

The SI unit of illuminance equal to the illumination on a surface, all points of which are at a distance of 1 meter from a uniform point source of 1 candela; 1 lux is equal to 1 lumen per square meter (1 lm/m2).
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

lux

A unit of measurement of the light intensity on a surface area. Lux differs from "lumens." The lux rating will decrease the farther away it is measured from the light source, but the lumen rating will remain the same.

One lux is equal to the illumination of a surface one meter away from a single candle; technically, one lumen per square meter. Whereas a "lumen" measures light intensity in all directions from a light source, "lux" measures the intensity in a specific location from the source. See lumen and candela.
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