Electrical Lighting Technician
1. Electrical Lighting Technicians (ELT) or simply Lighting Tech., are involved with rigging stage and location sets and controlling artificial, electric lights for art and entertainment venues (theater or live music venues) or in video, television, or film production…In video, television, and film productions, lighting technicians work under the direction of the Gaffer or Chief Lighting Technician whom takes their direction from the cinematographer.
Source: Wikipedia