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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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Koceljeva (Serbian Cyrillic: Коцељева) is a village and municipality located in the Mačva District of western Serbia. According to the 2011 census results, the population of the village is 4,182, while population of the municipality is 13,129.
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