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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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Perná is a village and municipality (obec) in Břeclav District in the South Moravian Region of the Czech Republic.
The municipality covers an area of 9.33 square kilometres (3.60 sq mi), and has a population of 764 (as at 28 August 2006).
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