P

Phot

Unit of measurement

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.

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Phot

Unit of measurement

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.

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From Wikipedia

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. Metric equivalence: 1 p h o t = 1 l u m e n c e n t i m e t r e 2 = 10 , 000 l u m e n s m e t r e 2 = 10 , 000 l u x = 10 k i l o l u x {\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

Text: Wikipédia, CC BY-SA 4.0. ·

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