Bắc Kạn vs Lux

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Bắc Kạn (listen) is the capital of Bắc Kạn Province, Vietnam. The province's only city, it is bordered by Bạch Thông District to the north, north-east and west and Chợ Mới District to the south-east and south-west.The town traces its origins to a fort established in 1880 and upgraded to city on 11 March 2015.

It is divided into six wards: Nguyễn Thị Minh Khai, Đức Xuân, Sông Cầu, Phùng Chí Kiên, Huyền Tụng and Xuất Hóa and 2 communes: Dương Quang, Nông Thượng.

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