phot
phot (unit of illuminance)
noun FOT Rare
Origin: From Greek phos, photos, 'light'
Usage Note
Phot is an obsolete CGS unit of illuminance equal to 10,000 lux. It is rarely encountered outside historical scientific texts, having been superseded by the lux (SI). It should not be confused with the prefix photo-. The word is invariable in the plural.
Examples
"Un phot équivaut à dix mille lux."
Natural Translation
One phot equals ten thousand lux.
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