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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.
Hoonah (Tlingit: Xunaa or Gaaw Yat’aḵ Aan) is a largely Tlingit community on Chichagof Island,...
Saarbrücken (, also US: , German: [zaːɐ̯ˈbʁʏkn̩] (listen); French: Sarrebruck [saʁbʁyk]; Rhine...
Leeds is the largest city in the county of West Yorkshire, England. Leeds is to the east of...