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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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Fresno ( FREZ-noh; Spanish for '"ash tree"') is a city in and the county seat of Fresno County, California, United States. It covers about 112 square miles (290 km2) in the center of the San Joaquin Valley, the southern portion of California's Central Valley.
Named for the abundant ash trees lining the San Joaquin River, Fresno was founded in 1872 as a railway station of the Central Pacific Railroad before it was incorporated in 1885. The city has since become an economic hub of Fresno County and the San Joaquin Valley, with much of the surrounding areas in the Metropolitan Fresno region predominantly tied to large-scale agricultural production.
The population of Fresno grew from 134,000 in 1960 to 428,000 in 2000.