SI unit of illuminance

illuminance produced on a surface of area 1 m2 by a luminous flux of 1 lm uniformly distributed over that surface

Symbol: lx = lm·m-2

NOTE     Non-metric, non-SI units: lumen per square foot (symbol: lm·ft-2), footcandle (symbol: fc) (US)

1 lm·ft-2 = 1 fc = 10,764 lx.


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