South Derbyshire vs Lux

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South Derbyshire is a local government district in Derbyshire, England. The population of the local authority at the 2011 Census was 94,611. It contains a third of the National Forest, and the council offices are in Swadlincote.

The district was formed on 1 April 1974 as a merger of the Swadlincote urban district along with Repton Rural District and part of South East Derbyshire Rural District.

Source: Wikipedia

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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.

In English, "lux" is used as both the singular and plural form.The word is derived from the Latin word for "light", lux.

Source: Wikipedia