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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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Harare (; officially Salisbury until 1982) is the capital and most populous city of Zimbabwe. The city proper has an area of 960.6 km2 (371 mi2) and an estimated population of 1,606,000 in 2009, with 2,800,000 in its metropolitan area in 2006. Situated in north-eastern Zimbabwe in the country's Mashonaland region, Harare is a metropolitan state, which also integrates the municipalities of Chitungwiza and Epworth. The city sits on a plateau with an elevation of 1,483 metres (4,865 feet) above sea level and its climate falls into the subtropical highland category.
The city was founded in 1890 by the Pioneer Column, a small military force of the British South Africa Company, and named Fort Salisbury after the UK Prime Minister Lord Salisbury.
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