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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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Shiquanhe (Chinese: 狮泉河镇; lit. 'Lion Spring River Town'), known in Tibetan as Sênggêkanbab (Tibetan: སེང་གེ་ཁ་འབབ་, Wylie: seng ge kha 'bab, THL: seng gé kha bap) or Sênggêzangbo, is the main town and administrative seat of Ngari Prefecture, Tibet Autonomous Region, China.
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