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 | + | 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. |
- | ---- | + | {| class="wikitable" |
- | + | !'''[[Illuminance]]'''!!Example | |
+ | |- | ||
+ | |10<sup>-5</sup> lux ||Light from the brightest star '''[[Sirius]]''' | ||
+ | |- | ||
+ | |10<sup>-4</sup> 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 '''[[latitude]]'''s | ||
+ | |- | ||
+ | |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]]''' | ||
+ | |} | ||
- | Reference | + | |
- | * | + | == '''Also See''' == |
+ | *'''[[Sunlight]]''' | ||
+ | *'''[[Lighting Installation]]''' | ||
+ | *'''[[Daylight]]''' | ||
+ | *'''[[Moonlight]]''' | ||
+ | *'''[[Sunlight]]''' | ||
+ | *'''[[Lighting Installation]]''' | ||
+ | *'''[[Daylight]]''' | ||
+ | *'''[[Lux]]''' | ||
+ | *'''[[Metal Halide lamp]]''' | ||
+ | *'''[[Albedo]]''' | ||
+ | *'''[[Metal Halide lamp]]''' | ||
+ | *'''[[Color Temperature]]''' | ||
+ | *'''[[LED]]''' | ||
+ | |||
+ | == '''Reference''' == | ||
+ | * Wikipedia Reference see '''''Lux''''' [http://en.wikipedia.org/wiki/Lux] | ||
+ | |||
+ | |||
+ | ---- | ||
+ | Return to '''[[Snow and Weather Glossary]]''', '''[[Working with Snow]], [[Freestyle Skiing]]''' | ||
[[Category:Freestyle Glossary]][[Category:Working with Snow and the Weather]][[Category:Weather]][[Category:Snow]][[Category:Freestyle Course Preparation]] | [[Category:Freestyle Glossary]][[Category:Working with Snow and the Weather]][[Category:Weather]][[Category:Snow]][[Category:Freestyle Course Preparation]] |
Current revision
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.
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 |
[edit] Also See
- Sunlight
- Lighting Installation
- Daylight
- Moonlight
- Sunlight
- Lighting Installation
- Daylight
- Lux
- Metal Halide lamp
- Albedo
- Metal Halide lamp
- Color Temperature
- LED
[edit] Reference
- Wikipedia Reference see Lux [1]
Return to Snow and Weather Glossary, Working with Snow, Freestyle Skiing