lux

Similar Terms: Lux,lx

lux (symbol; lx) is the >SI unit of illuminance – how brightly a surface is illuminated. One lux is equal to 1 >Lumen per square meter. It is the measure of light intensity, as percieved by the human eye, of the light that illuminates or passes through a surface.

 

Video and surveillance cameras often include a minimum illuminance level of lux at which the camera will record a satisfactory image. A camera with good low-light capability (night vision camera) will have a lower lux rating. Still cameras do not use such a specification, since longer exposure times can generally be used to make pictures at very low illuminance levels.

 

Lumens measure >Luminous Flux, or the amount of light produced by a light source, whereas Lux is intended to explain how many >Lumens are needed to illuminate a particular area.

 

Some Examples of Lux
0.0005 lux Starlight without moon
0.01 lux  Quarter Moon
1 lux  Full moon overhead near the equator
50 lux  Family living room lights
320 - 500 lux  Office lighting
10,000 - 25,000  Full Daylight (not direct sunlight)

 

 

 

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