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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.
Hattiesburg | |
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Population | 45989 |
Hattiesburg is a city in the U.S. state of Mississippi, primarily in Forrest County (where it is the county seat) and extending west into Lamar County. The city population was 45,989 at the 2010 census, with an estimated population of 45,863 in 2019.
It is the principal city of the Hattiesburg, Mississippi, Metropolitan Statistical Area, which encompasses Forrest, Lamar and Perry counties.
Development of the interior of Mississippi by European Americans took place primarily after the American Civil War. Before that time, only properties along the major rivers were developed as plantations. Founded in 1882 by civil engineer William H. Hardy, Hattiesburg was named in honor of Hardy's wife Hattie.
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