lux

Definition

In the International System of Units, the derived unit of illuminance or illumination; one lumen per square metre. Symbol: lx

Etymology

Borrowed from Latin lūx (“light”), from Proto-Indo-European *lewk- (“white; light; bright”). Cognates include Ancient Greek λευκός (leukós, “white, blank, light, bright, clear”), Ancient Greek λύκη (lúkē, “light, morning twilight”), Sanskrit रोचते (rocate), Middle Persian 𐭩𐭥𐭬 (rōz, “day”) and Old English lēoht (noun) (English light).

Example Sentences

• "Some volunteers slept in ambient light of about 100 lux and some in only 3 lux, which is close to total darkness."
• "For quotations using this term, see Citations:lux."