Lux vs Alba

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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

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Alba (English: ) is the Scottish Gaelic name (pronounced [ˈal̪ˠapə]) for Scotland. It is cognate with the Irish term Alba (gen. Alban, dat. Albain) and the Manx term Nalbin, the two other Goidelic Insular Celtic languages, as well as contemporary words used in Cornish (Alban) and Welsh (Yr Alban), both of which are Brythonic Insular Celtic languages.

(The third surviving Brythonic language, Breton, instead uses Bro-Skos, meaning 'country of the Scots'.) In the past these terms were names for Great Britain as a whole, related to the Brythonic name Albion.

Source: Wikipedia