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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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San Salvador ("Holy Savior") is the capital and the most populous city of El Salvador and its eponymous department. It is the country's political, cultural, educational and financial center. The Metropolitan Area of San Salvador, which comprises the capital itself and 13 of its municipalities, has a population of 2,404,097.
As a "beta" global city, San Salvador is also an important financial hub of Central America. The city is home to the Concejo de Ministros de El Salvador (Council of Ministries of El Salvador), La Asamblea Legislativa (The Legislative Assembly of El Salvador), the Corte Suprema de Justicia (The Supreme Court), and other governmental institutions, as well as the official residence of the president of the Republic. San Salvador is located in the Salvadoran highlands, surrounded by volcanoes and prone to earthquakes. The city is also home to the Catholic Archdiocese, as well as many Protestant branches of Christianity, including Evangelicals, Latter-day Saints, Baptists, and Pentecostals.
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