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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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Siegen (German pronunciation: [ˈziːɡn̩] (listen)) is a city in Germany, in the south Westphalian part of North Rhine-Westphalia.
It is located in the district of Siegen-Wittgenstein in the Arnsberg region. The university town (nearly 20000 students in the 2018–2019 winter semester) is the district seat, and is ranked as a "higher centre" in the South Westphalian urban agglomeration.
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