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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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Mykolaiv (Ukrainian: Микола́їв [mɪkoˈlɑjiu̯] (listen)), also known as Nikolaev or Nikolayev (Russian: Никола́ев [nʲɪkɐˈla(j)ɪf]) is a city in southern Ukraine, the administrative center of the Mykolaiv Oblast. Mykolaiv is arguably the main shipbuilding center of the Black Sea. Aside from three shipyards within the city, there are a number of research centers specializing in shipbuilding such as the State Research and Design Shipbuilding Center, Zoria-Mashproekt and others. The city has a population of 480,080 (2020 est.
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