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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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Salisbury (locally SAWZ-bər-ee) is a cathedral city in Wiltshire, England, with a population of 40,302, at the confluence of the rivers Avon, Nadder and Bourne. The city is approximately 20 miles (32 km) from Southampton and 30 miles (48 km) from Bath.
Salisbury is in the southeast of Wiltshire, near the edge of Salisbury Plain. Salisbury Cathedral was formerly north of the city at Old Sarum. Following the cathedral's relocation, a settlement grew up around it which received a city charter in 1227 as New Sarum, which continued to be its official name until 2009, when Salisbury City Council was established.
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