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unit of measure: the base unit | the supplementary unit | the derived unit

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unit

Illuminance

Definition

The illuminance is the physical measure, which defines the ratio of luminous flow emitted by a light source on an area, to the area of this surface.

1 lux is the illuminance of a source with an area of 1 square meter that emits luminous flux equal to 1 lumen.

 

system of units:   SI;
statute:   derived unit (with a special name);
name the value:   E;
unit name:   lux;
symbol unit:   lx;
relationship of definition:   E = Φ/S;
dimension:   L-2 J;
expression in other units:   lm/ft², ph;

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Units of measurement

namesymbol value in SI unit:
lx
note
1 footcandleft·cd≈ 10.763 91 
1 lumen per square footlm/ft²≈ 10.763 91 
1 photph= 10 000 
1 lumen per square centimeterlm/cm²= 10 000 
1 lumen per square meterlm/m²= 1.0 
1 candela steradian per square metercd·sr/m²= 1.0 
1 nox = 0,001 
1 centimeter-candelacm·cd= 0.01 
1 metre-candelam·cd= 1.0