Lux

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A lux meter for measuring illuminances in work places. The lux (symbol: lx) is the SI unit of illuminance and luminous emittance. It is used in photometry as a measure of the apparent intensity of light hitting or passing through a surface. It is analogous to the radiometric unit watts per square meter, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human brightness perception.

IlluminanceExample
10-5 lux Light from the brightest star Sirius
10-4 luxTotal starlight, overcast sky
0.002 luxMoonless clear night sky with airglow
0.01 luxQuarter moon
0.27 luxFull moon on a clear night
1 luxFull moon overhead at tropical latitudes
3.4 lux Dark limit of civil twilight under a clear sky
50 luxFamily living room
80 luxHallway/toilet
100 lux Very dark overcast day
320 lux Recommended office lighting
400 lux Sunrise or sunset on a clear day. Well-lit office area.
500 lux Lighting level for an office according to the European law UNI EN 12464.
1,000 luxOvercast day
10,000–25,000 lux Full daylight (not direct sun)
32,000–130,000 luxDirect sunlight


[edit] Also See

[edit] Reference

  • Wikipedia Reference see Lux [1]



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