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Phot

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From Wikipedia, the free encyclopedia
 

Measure of illuminance

For the 9th-century theologian and scholar, see Patriarch Photius I of Constantinople.

Phot
Unit system	CGS units
Unit of	Illuminance
Symbol	ph
Conversions
1 phin ...	... is equal to ...
SI derived unit	10000 lx
SAE units	929 fc

Aphot (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:

${\displaystyle 1\ \mathrm {phot} =1\ {\frac {\mathrm {lumen} }{\mathrm {centimetre} ^{2}}}=10,000\ {\frac {\mathrm {lumens} }{\mathrm {metre} ^{2}}}=10,000\ \mathrm {lux} =10\ \mathrm {kilolux} }$

Metric dimensions:

Illuminance = luminous intensity × solid angle / length²

• Illuminance
• Lumen (unit)
• Lux
• Photometry (optics)
• Light

• Knowledgedoor, LLC (2005). Library of Units and Constants: Illuminance Quantity. Retrieved 2006-07-21.
• Illuminance Converter. Retrieved 2006-07-21.