1) CGS unit of illumination 2) Illumination unit 3) Light measure 
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 dimensions: == See also == ...
A unit of illumination equal to one lumen per square centimetre.
A unit of illumination; 1 phot equals 1 lumen/cm2 of surface. ... Origin: G. Phos (phot-), light ... (05 Mar 2000) ... 
(ph) A measurement unit for illuminance. One phot = 10,000 lux (lx).
Type: Term Pronunciation: fōt Definitions: 1. A unit of illumination; 1 phot equals 1 lumen/cm2 of surface.
A phot is a unit of luminous flux equal to the illumination produced by one lumen on a surface of one square centimetre.
[n] - a unit of illumination equal to 1 lumen per square centimeter
phot A unit of illumination in the centimeter-gram-second system equal to one lumen per square centimeter.
A photometric light unit for very strong illumination levels. One phot is equal to 10,000 lux.
noun a unit of illumination equal to 1 lumen per square centimeter; 10,000 phots equal 1 lux