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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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Liverpool is a city and metropolitan borough in Merseyside, England. Its population in 2019 was approximately 498,042, making it the tenth-largest English district by population. Liverpool's metropolitan area is the fifth-largest in the UK with a population of 2.24 million.Liverpool is on the eastern side of the Mersey Estuary and historically lay within the ancient hundred of West Derby in North West England's county of Lancashire. It became a borough in 1207, a city in 1880, and a county borough independent of Lancashire in 1889. Its growth as a major port was paralleled by the expansion of the city throughout the Industrial Revolution. Along with general cargo, freight, and raw materials such as coal and cotton, merchants were involved in the slave trade. In the 19th century, Liverpool was a major port of departure for English and Irish emigrants to North America. It was also home to both the Cunard and White Star Lines, and was the port of registry of the ocean liners RMS Titanic, RMS Lusitania, RMS Queen Mary, and RMS Olympic.
In 2019, Liverpool was ranked fifth on the list of the most visited UK cities. It is noted for its culture, architecture, and transport links. The city is closely associated with the arts, especially music; the popularity of the Beatles, who are widely regarded as the most influential musical group in history, cemented the city's status as a tourist destination. Since then, Liverpool has continued to produce many notable musicians and record labels—musicians from the city have produced 56 No. 1 hit singles, more than any other city in the world. It also has a long-standing reputation as the origin of various actors and actresses, artists, athletes, comedians, journalists, novelists, and poets.
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