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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 It is rarely encountered outside historical scientific texts, having been superseded by the lux (SI).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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