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{{For|the 9th-century theologian and scholar|Patriarch Photius I of Constantinople}} | |||
A '''phot''' ('''ph''') is a [[photometry (optics)|photometric]] unit of [[illuminance]], or [[luminous flux]] through an area. It is not an [[SI]] unit, but rather is associated with the older [[centimetre gram second system of units]]. The name was coined by [[André Blondel]] in 1921.<ref>Parry Moon. "System of photometer concepts", in the ''Journal of the Optical Society of America'', volume 32, number 6 (June 1942). – Page 355: "The lumen was proposed by Blondel in 1894 and is now universally accepted. The names, phot and stilb were likewise coined by Blondel (1921) and are in general use on the Continent."</ref> | |||
Metric equivalence: | |||
:<math>1\ \mathrm{phot} = 1\ \frac{\mathrm{lumen}}{\mathrm{centimeter}^2} = 10,000\ \frac{\mathrm{lumens}}{\mathrm{meter}^2} = 10,000\ \mathrm{lux} = 10\ \mathrm{kilolux}</math> | |||
Metric dimensions: | |||
:illuminance = [[luminous intensity]] × [[solid angle]] / length<sup>2</sup> | |||
== See also == | |||
*[[Illuminance]] | |||
*[[Lumen (unit)]] | |||
*[[Lux]] | |||
*[[Photometry (optics)]] | |||
*[[Light]] | |||
== References == | |||
<references/> | |||
* Knowledgedoor, LLC (2005). [http://www.knowledgedoor.com/1/Library_of_Units_and_Constants/Quantity_Index/illuminance.htm Library of Units and Constants: Illuminance Quantity]. Retrieved 2006-07-21. | |||
* [http://www.convertthis.com/converters/illuminance.aspx Illuminance Converter]. Retrieved 2006-07-21. | |||
[[Category:Photometry]] | |||
[[Category:Units of illuminance]] | |||
[[Category:Centimetre–gram–second system of units]] |
Revision as of 22:04, 17 January 2014
28 year-old Painting Investments Worker Truman from Regina, usually spends time with pastimes for instance interior design, property developers in new launch ec Singapore and writing. Last month just traveled to City of the Renaissance. A phot (ph) is a photometric unit of illuminance, or luminous flux through an area. It is not an SI unit, but rather is associated with the older centimetre gram second system of units. The name was coined by André Blondel in 1921.[1]
Metric equivalence:
Metric dimensions:
- illuminance = luminous intensity × solid angle / length2
See also
References
- ↑ Parry Moon. "System of photometer concepts", in the Journal of the Optical Society of America, volume 32, number 6 (June 1942). – Page 355: "The lumen was proposed by Blondel in 1894 and is now universally accepted. The names, phot and stilb were likewise coined by Blondel (1921) and are in general use on the Continent."
- Knowledgedoor, LLC (2005). Library of Units and Constants: Illuminance Quantity. Retrieved 2006-07-21.
- Illuminance Converter. Retrieved 2006-07-21.