In theatrical setups, what term is used for equipment that is essential for lighting?

The term used for equipment that is essential for lighting in theatrical setups is "Electrics." This encompasses all the hardware and fixtures necessary for lighting design and implementation in a production.

Electrics typically includes lighting instruments, such as spotlights and floodlights, as well as associated electrical components like dimmers, control boards, and cabling that allows the lighting to be manipulated and operated effectively during a performance. It serves as the backbone for illuminating the stage, setting the mood, and highlighting aspects of the production.

In contrast, scrim refers to a type of fabric used in theatrical productions that can either be transparent or opaque depending on the lighting, but it is not a piece of equipment essential for lighting itself. A backdrop is a scenic element that provides visual context to the stage setting, but it does not fall under the category of lighting equipment. Floor pockets are access points on the stage floor for running electrical cables but are also not classified as lighting equipment; instead, they facilitate the setup of the electrics system. Thus, "Electrics" is the most fitting term for essential lighting equipment in theatre.