Videophot
/fɔt/
The word phot refers to a specific metric unit of illuminance used to measure how much light falls onto a surface. While it is less common today than the standard SI unit known as the lux, understanding the phot is essential for anyone studying physics, lighting design, or historical scientific texts. This lesson covers the technical definition of the phot, its relationship to lumens and lux, and its Greek origins. You will also learn about subunits like the milliphot and see how the term is applied in professional engineering contexts. Watch this lesson to master this specialized terminology.
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