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The lux (symbol: lx) is the SI derived unit of illuminance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface. It is analogous to the radiometric unit watt per square metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human visual brightness perception.
Valky | |
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Valky (Ukrainian: Валки) is a city in Kharkiv Oblast (province) of Ukraine. It serves as the administrative center of Valky Raion. Population: 8,783 (2020 est.
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