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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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Dundee ( (listen); Scots: Dundee Scottish Gaelic: Dùn Dè or Dùn Dèagh [ˈt̪uːn tʲeː]) is Scotland's fourth-largest city and the 51st-most-populous built-up area in the United Kingdom. The mid-year population estimate for 2016 was
148,280, giving Dundee a population density of 2,478/km2 or 6,420/sq mi, the second-highest in Scotland. It lies within the eastern central Lowlands on the north bank of the Firth of Tay, which feeds into the North Sea. Under the name of Dundee City, it forms one of the 32 council areas used for local government in Scotland.
Historically part of Angus, the city developed into a burgh in the late 12th century and established itself as an important east coast trading port. Rapid expansion was brought on by the Industrial Revolution, particularly in the 19th century when Dundee was the centre of the global jute industry. This, along with its other major industries, gave Dundee its epithet as the city of "jute, jam and journalism".
Today, Dundee is promoted as "One City, Many Discoveries" in honour of Dundee's history of scientific activities and of the RRS Discovery, Robert Falcon Scott's Antarctic exploration vessel, which was built in Dundee and is now berthed at Discovery Point. Biomedical and technological industries have arrived since the 1980s, and the city now accounts for 10% of the United Kingdom's digital entertainment industry, including mobile app development and gaming.