| ph | phial; phot |
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| phot | A unit of illumination; 1 phot equals 1 lumen/cm2 of surface. Origin: G. Phos (phot-), light (05 Mar 2000) |
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| phot- |
a unit of illumination equal to 1 lumen per square centimeter; 10,000 phots equal 1 lux
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