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Marj (Arabic: المرج Al Marǧ, English: The Meadows), also spelt El Merj, generally believed to be on the site of the ancient city of Barca or Barce, is a city in northeastern Libya and the administrative seat of the Marj District. It lies in an upland valley separated from the Mediterranean Sea by a range of hills, part of the Jebel Akhdar Mountains.
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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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