Lux
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|32,000–130,000 '''[[lux]]'''||Direct '''[[sunlight]]''' | |32,000–130,000 '''[[lux]]'''||Direct '''[[sunlight]]''' | ||
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+ | == Also See == | ||
+ | *'''[[Sunlight]]''' | ||
+ | *'''[[Lighting Installation]]''' | ||
+ | *'''[[Daylight]]''' | ||
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Revision as of 15:49, 12 July 2010
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 metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human brightness perception.
Illuminance | Example |
---|---|
10-5 lux | Light from the brightest star Sirius |
10-4 lux | Total starlight, overcast sky |
0.002 lux | Moonless clear night sky with airglow |
0.01 lux | Quarter moon |
0.27 lux | Full moon on a clear night |
1 lux | Full moon overhead at tropical latitudes |
3.4 lux | Dark limit of civil twilight under a clear sky |
50 lux | Family living room |
80 lux | Hallway/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 lux | Overcast day |
10,000–25,000 lux | Full daylight (not direct sun) |
32,000–130,000 lux | Direct sunlight |
Also See
Return to Snow and Weather Glossary, Working with Snow, Freestyle Skiing
Reference
- 1 Wikipedia Reference see Lux [1]