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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.
Leeuwarden (US: , Dutch: [ˈleːʋɑrdə(n)] (listen); West Frisian: Ljouwert [ˈljɔːʋ(ə)t]/[ˈʎɔːw(ə)t]...
Jabalpur (English: , US also , Hindi: [dʒəbəlˈpʊɾ]; formerly known as Jubbulpore, the official...
Bilbao (, also US: , Spanish: [bilˈβao]; Basque: Bilbo [bilβo]) is a city in northern Spain, the...