Phot

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

A phot (ph) is a photometric unit of illuminance, or luminous flux through an area. It is not an SI unit, but is equivalent to 10000 lux.

Metric equivalence:

1\ \mathrm{phot} = 1\ \frac{\mathrm{lumen}}{\mathrm{centimeter}^2} = 10000\ \frac{\mathrm{lumens}}{\mathrm{meter}^2} = 10000\ \mathrm{lux} = 10\ \mathrm{kilolux}

Metric dimensions:

illuminance = luminous intensity × solid angle / length2

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