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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.
Bilbao (, also US: , Spanish: [bilˈβao]; Basque: Bilbo [bilβo]) is a city in northern Spain, the...
The Hague (; Dutch: Den Haag [dɛn ˈɦaːx] (listen) or 's‑Gravenhage [ˌsxraːvə(n)ˈɦaːɣə] (listen))...
Broadly speaking, liberty is the ability to do as one pleases, or a right or immunity enjoyed by...
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