A unit of measurement for illuminance, equal to one lumen per square meter.
From Latin 'lux' meaning 'light.' Adopted into scientific terminology in the early 20th century as photometry became standardized. Related to 'luxury,' 'lucid,' and other light-based words.
The lux connects ancient human fascination with light to modern precision measurement - from the Latin poets praising 'lux' to contemporary lighting designers calculating exact illumination levels. A bright sunny day measures about 100,000 lux, while a full moon provides only about 0.2 lux.
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