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]
