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Orem is a city in Utah County, Utah, United States, in the northern part of the state. It is adjacent to Provo, Lindon, and Vineyard and is approximately 45 miles (72 km) south of Salt Lake City. Orem is one of the principal cities of the Provo-Orem, Utah Metropolitan Statistical Area, which includes all of Utah and Juab counties. The 2019 population estimate was 97,828, while the 2010 population was 88,328 making it the fifth-largest city in Utah.
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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.