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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.
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Vaasa (Finnish: [ˈʋɑːsɑ]; Swedish: Vasa, Finland Swedish: [ˈvɑːsɑ] (listen), Sweden Swedish: [ˈvɑ̂ːsa] (listen)) is a city on the west coast of Finland. It received its charter in 1606, during the reign of Charles IX of Sweden and is named after the Royal House of Vasa. Vaasa has a population of 66,960 (31 July 2020) (approximately 120,000 in the Vaasa sub-region), and is the regional capital of Ostrobothnia (Swedish: Österbotten; Finnish: Pohjanmaa).
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