Lux

From Fiswiki

(Difference between revisions)
Jump to: navigation, search
Revision as of 15:36, 17 April 2009 (edit)
Joe (Talk | contribs)

← Previous diff
Current revision (21:24, 24 August 2011) (edit) (undo)
Joe (Talk | contribs)
('''Also See''')
 
(15 intermediate revisions not shown.)
Line 1: Line 1:
-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. +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" {| class="wikitable"
-!Illuminance!!Example+!'''[[Illuminance]]'''!!Example
|- |-
-|10<sup>-5</sup> lux ||Light from the brightest star ([[Sirius]])<ref name="radfaq">Paul Schlyter, [http://stjarnhimlen.se/comp/radfaq.html#10 Radiometry and photometry in astronomy FAQ] (2006)</ref>+|10<sup>-5</sup> lux ||Light from the brightest star '''[[Sirius]]'''
|- |-
-|10<sup>-4</sup> lux||Total [[starlight]], overcast sky<ref name=radfaq/>+|10<sup>-4</sup> lux||Total '''[[starlight]]''', overcast sky
|- |-
-|0.002 lux||Moonless clear night sky with [[airglow]]<ref name=radfaq/>+|0.002 [[lux]]||Moonless clear night sky with '''[[airglow]]'''
|- |-
-|0.01 lux||Quarter moon+|0.01 [[lux]]||Quarter moon
|- |-
-|0.27 lux||Full moon on a clear night<ref name=radfaq/><ref>{{cite web | url=http://en.petzl.com/petzl/frontoffice/Lampes/static/referentiel/present_referentiel_en.jsp |title=Petzl reference system for lighting performance |accessdate=2007-04-24 |format=html }}</ref>+|0.27 [[lux]]||Full moon on a clear night
|- |-
-|1 lux||Full moon overhead at tropical [[latitude]]s<ref>{{cite journal |last=Bunning |first=Erwin |coauthors= and Moser, Ilse |year=1969 |month=April |title=Interference of moonlight with the photoperiodic measurement of time by plants, and their adaptive reaction |journal=Proceedings of the National Academy of Sciences of the United States of America |volume=62 |issue=4 |pages=1018–1022 |url=http://www.pnas.org/cgi/reprint/62/4/1018 |doi=10.1073/pnas.62.4.1018 |accessdate=2006-11-10 |pmid=16591742 }}</ref>+|1 lux||Full moon overhead at tropical '''[[latitude]]'''s
|- |-
-|3.4 lux|| Dark limit of civil [[twilight]] under a clear sky<ref>{{cite web |url=http://www.burle.com/cgi-bin/byteserver.pl/pdf/Electro_Optics.pdf |title=Electro-Optics Handbook |format=pdf |work=burle.com |pages=p. 63}}</ref>+|3.4 lux|| Dark limit of civil '''[[twilight]]''' under a clear sky
|- |-
-|50 lux||Family living room<ref>{{Citation|first=Alan |last=Pears |publisher=Australian Greenhouse Office|title=Strategic Study of Household Energy and Greenhouse Issues|date=June, 1998|url=http://www.energyrating.gov.au/library/pubs/pears-ago1998.pdf |format=PDF|chapter=Chapter 7: Appliance technologies and scope for emission reduction |page=61 |accessdate =2008-06-26}}.</ref>+|50 lux||Family living room
|- |-
-|80 lux||Hallway/toilet<ref>{{Citation|author=Australian Greenhouse Office|title=Working Energy Resource and training kit: Lighting|date=May, 2005|url=http://www.greenhouse.gov.au/lgmodules/wep/lights/index.html|contribution=Chapter 5: Assessing lighting savings|contribution-url=http://www.greenhouse.gov.au/lgmodules/wep/lights/training/training9.html|accessdate =2007-03-13|format={{dead link|date=June 2008}} – <sup>[http://scholar.google.co.uk/scholar?hl=en&lr=&q=intitle%3AWorking+Energy+Resource+and+training+kit%3A+Lighting&as_publication=&as_ylo=&as_yhi=&btnG=Search Scholar search]</sup>}}.</ref>+|80 [[lux]]||Hallway/'''[[toilet]]'''
|- |-
-|100 lux ||Very dark overcast day<ref name=radfaq/>+|100 [[lux]] ||Very dark overcast day
|- |-
-|320 lux || Recommended office lighting (Australia)<ref>{{cite web |url=http://www.energy-toolbox.vic.gov.au/energy_toolbox/summer_push/how_to_use_a_lux_meter.html|title=How to use a lux meter (Australian recommendation)}}</ref>+|320 [[lux]] || Recommended office lighting
|- |-
-|400 lux ||[[Sunrise]] or [[sunset]] on a clear day. Well-lit office area.+|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.+|500 [[lux]] ||Lighting level for an office according to the European law UNI EN 12464.
|- |-
-|1,000 lux||Overcast day<ref name=radfaq/>; typical [[TV studio]] lighting +|1,000 [[lux]]||Overcast day
|- |-
-|10,000–25,000 lux ||Full [[daylight]] (not direct sun)<ref name=radfaq/>+|10,000–25,000 '''[[lux]]''' ||Full '''[[daylight]]''' (not direct sun)
|- |-
-|32,000–130,000 lux||Direct [[sunlight]]+|32,000–130,000 '''[[lux]]'''||Direct '''[[sunlight]]'''
|} |}
----- 
-Return to [[Working with Snow]], [[Freestyle Skiing]] 
-Reference+== '''Also See''' ==
-*1 Wikipedia Reference [[http://en.wikipedia.org/wiki/Lux]]+*'''[[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.

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]



Return to Snow and Weather Glossary, Working with Snow, Freestyle Skiing

Personal tools