CIE ISO DIS 23539:2021
Photometry – The CIE system of physical photometry
standard by Commission Internationale de L'Eclairage, 2022
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The purpose of photometry is to measure light as perceived by the human eye. The brightness of a luminous surface depends not only on the amount of radiation it emits, transmits or reflects, but also on its spectral composition and on the visual response function of the observer viewing it.
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