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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.
Jijel | |
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Population | 134839 |
Jijel (Arabic: جيجل), the classical Igilgili, is the capital of Jijel Province in north-eastern Algeria. It is flanked by the Mediterranean Sea in the region of Corniche Jijelienne and had a population of 131,513 in 2008.
Jijel is the administrative and trade center for a region specialising in cork processing, leather tanning and steelmaking.