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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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Erie (; EER-ee) is a city on the south shore of Lake Erie and the county seat of Erie County, Pennsylvania, United States.
The city was named for the Native American Erie people who lived in the area until the mid-17th century. Erie is the fourth-largest city in Pennsylvania, and the largest city in Northwestern Pennsylvania, with a population of 101,786 at the 2010 census. The estimated population in 2019 had decreased to 95,508. The Erie metropolitan area, equivalent to all of Erie County, consists of 276,207 residents. The Erie-Meadville combined statistical area had a population of 369,331, as of the 2010 Census.
Erie is halfway between the cities of Buffalo, New York, and Cleveland, Ohio, and due north of Pittsburgh, Pennsylvania.