Lumens per watt gauge of the efficiency of a light source.
Electrical Box:
Box in the wall where electrical associates are made to fixtures and that supports fixtures.
Electric Meter:
Device that measures quantity of electricity consumed.
Ellipsoidal Reflector Spotlight (ERS):
The most universal theatrical lighting fixture employing an ellipsoidal reflector, a sharp focusing lens system, and also for framing or shuttering devices. Commonly called a Leko or, in the UK a profile spot, the ERS has the aptitude to project patterns (gobos) and make very precise shutter cuts.
