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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.
Ulyanovsk | |
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Population | 619492 |
Ulyanovsk is a city and the administrative center of Ulyanovsk Oblast, Russia, located on the Volga River 705 kilometers (438 mi) east of Moscow. 613,786 (2010 Census); 635,947 (2002 Census); 625,155 (1989 Census).The city, founded as Simbirsk (Симбирск), is the birthplace of Vladimir Lenin (born Ulyanov), for whom it was renamed after his death in 1924, and Alexander Kerensky, the leader of the Russian Provisional Government that was overthrown by Lenin during the October Revolution of 1917.
Katowice (UK: KAT-ə-VEET-sə, US: KAHT-, Polish: [katɔˈvitsɛ] (listen); Silesian: Katowicy;...
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