One of the mysteries of the English language finally explained.
A unit of illumination equal to one lumen per square centimeter.
- ‘Select this table to convert between different units such as lux, flame, phot, nox, lumen/square meter, meter-candle, and more.’
- ‘A centimeter- candle is a phot.’
Early 20th century: from Greek phōs, phōt- ‘light’.
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