Convert between phot and other major units of illuminance.

The unit of illuminance in the cgs system of units. Symbol, ph. One phot = 10,000 lux.

According to the current national standard in the United StatesĀ¹, the phot is not to be used. Lux should be used instead.

1. IEEE/ASTM SI 10-2002.
American National Standard for Use of the International System of Units (SI): The Modern Metric System.
New York: IEEE, 30 December 2002.

See Section 3.3.3.

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