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Phot (ph) is a unit in the category of Illuminance. It is also known as phots. This unit is commonly used in the cgs unit system. Phot (ph) has a dimension of L^-2J where L is length, and J is luminous intensity. It can be converted to the corresponding standard SI unit lx by multiplying its value by a factor of 10000.

Note that the seven base dimensions are M (Mass), L (Length), T (Time), Q (Temperature), N (Aamount of Substance), I (Electric Current), and J (Luminous Intensity).

Other units in the category of Illuminance include Foot-Candle (ft-C, ft-cd, fc), and Lux (lx).