lux

noun

ˈləks 

plural lux or luxes

: a unit of illumination equal to the direct illumination on a surface that is everywhere one meter from a uniform point source of one candle intensity or equal to one lumen per square meter

Word History

Etymology

Latin, light — more at light

First Known Use

1889, in the meaning defined above

Kids Definition

lux

noun

ˈləks 

plural lux or luxes

: a unit that is used for measuring the amount of light falling on a surface and that is equal to one lumen per square meter

Medical Definition

lux

noun

ˈləks 

plural lux or luxes

: a unit of illumination equal to the direct illumination on a surface that is everywhere one meter from a uniform point source of one candle intensity or equal to one lumen per square meter

called also meter-candle