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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.
Manchester () is a city and metropolitan borough in Greater Manchester, England. The city has the...
Carlisle ( kar-LYLE, locally KAR-lyle; from Cumbric: Caer Luel; Scots: Cairel, Cairl, Caeril;...
Tbilisi (English: tə-bil-EE-see, tə-BIL-iss-ee; Georgian: თბილისი [tʰbilisi] (listen)), in some...