On a drama or stage show, there's always a person takes care of the lighting effects, but I don't know how to express that occupation. Does anyone know what it's called?
Learn English – the name of the occupation of the person in charge of lighting effects on stage
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Best Answer
The term "lighting technician" would probably be apt for a theatre or stage show.
Stage lighting
You asked for a shorter of more informal term, there is also the term gaffer.
Gaffer
Wikipedia link
However the definition of gaffer seems to always be given as a person on a movie or television set.
Also interesting:
Lighting technician
Also, note that "gaffer" isn't that common outside its respective industry. So if you're going to use it for a casual/everyday audience/readership, they probably won't know what you're talking about.