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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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Milwaukee (, locally ) is the largest city in the state of Wisconsin and the fifth-largest city in the Midwestern United States. The seat of Milwaukee County, it is on Lake Michigan's western shore. Ranked by its estimated 2018 population, Milwaukee was the 31st largest city in the United States. The city's estimated population in 2019 was 590,157. Milwaukee is the main cultural and economic center of the Milwaukee metropolitan area which had a population of 2,043,904 in the 2014 census estimate. It is the fourth-most densely populated metropolitan area in the Midwest, surpassed only by Chicago, Minneapolis-St. Paul and Detroit, respectively. Milwaukee is considered a "Gamma −" global city as categorized by the Globalization and World Cities Research Network with a regional GDP of over $105 billion.
The first recorded inhabitants of the Milwaukee area are the Algonquin and Siouan peoples. French Catholic Jesuits, who ministered to Native Americans and fur traders, were the first Europeans to pass through the area. In 1818, the French Canadian explorer Solomon Juneau established a permanent settlement, and in 1846, Juneau's town combined with two neighboring towns to incorporate as the city of Milwaukee. Large numbers of German immigrants arrived during the late 1840s, after the German revolutions, with Poles and other immigrants from eastern Europe arriving in the following decades.