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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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Winterthur ( VIN-tər-toor, German: [ˈvɪntɐtuːɐ̯]; French: Winterthour) is a city in the canton of Zürich in northern Switzerland. With over 110,000 residents it is the country's sixth-largest city by population, and is the ninth-largest agglomeration with about 140,000 inhabitants. Located about 20 kilometres (12 mi) northeast of Zürich, Winterthur is a service and high-tech industrial satellite city within Greater Zürich.
The official language of Winterthur is Swiss Standard German, but the main spoken language is the local variant of the Alemannic Swiss German dialect. Winterthur is usually abbreviated as Winti in the local dialect and by its inhabitants.
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