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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.
Aleppo ( ə-LEH-poh; Arabic: ﺣَﻠَﺐ / ALA-LC: Ḥalab, IPA: [ˈħalab]) is a city in Syria, which...
Laperche is a commune in the Lot-et-Garonne department in south-western France.
Barcelona ( BAR-sə-LOH-nə, Catalan: [bəɾsəˈlonə], Spanish: [baɾθeˈlona]) is a city on the coast...
Bucaramanga (Spanish pronunciation: [bukaɾaˈmaŋɡa]) is the capital and largest city of the...