phot
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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.
Key facts
- Unit.name
- Phot
- Unit.standard
- CGS units
- Unit.quantity
- Illuminance
- Unit.symbol
- ph
- Unit.units1
- SI derived unit
- Unit.units2
- SAE units
- Unit.inunits2
- 929 fc
via Wikipedia infobox
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Encyclopedic overview
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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\ \mathrm{phot} = 1\ \frac{\mathrm{lumen}}{\mathrm{centimetre}^2} = 10,000\ \frac{\mathrm{lumens}}{\mathrm{metre}^2} = 10,000\ \mathrm{lux} = 10\ \mathrm{kilolux}
Excerpted from Wikipedia’s “phot” article, available under the CC BY-SA 4.0 licence.