Lux

**Semantic type:** Quantitative Concept

**Definition:** A SI derived unit of illuminance equal to the direct illumination on a surface that is everywhere one meter from a uniform point source of one candela; a unit of illuminance that is equal to one lumen per square meter.

**Synonyms:** - lux - lux - lux - lx - lx - lx - lx - lx - lx - lx