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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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Zahlé (Arabic: زحلة) is the capital and the largest city of Beqaa Governorate, Lebanon. With around 120,000 inhabitants, it is the third largest city in Lebanon after Beirut and Tripoli, and the fourth largest taking the whole urban area (the Jounieh urban area is larger).
Zahlé is located 55 km (34 mi) east of the capital Beirut, close to the Beirut-Damascus road, and lies at the junction of the Lebanon mountains and the Beqaa plateau, at a mean elevation of 1,000 m.
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