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L

LUMEN / LUMENS
A measure of light output from a source. The brightness of video projectors is stated in Lumens.

LUMINAIR
The international term for lighting equipment. Not restricted to theater lighting.

LUX
A measure of the level of illumination on a surface (1 lumen spread over 1 metre).

LX
Short for Electrics. The department in the theater responsible for stage lighting and sometimes sound and maintenance of the building's electrical equipment.