When a light with a gobo is turned on, the cut-out pattern is projected onto the stage. This helps the audience follow unusual transitions. If the lights are properly hung, focused, gelled and wired, the lighting enhances a production's atmosphere. The Lighting Designer consults with the Stage Director, reads through the script and sits in on rehearsals to get a feel for the play. From there, the lights are wired through the dimmers to the board, gelled, and focused roughly until tech rehearsal , a run-through of the play devoted mainly to lighting, costumes, sound and set, with actors going through the motions as the directors and designers make notes and adjustments.
Top row is light area number, bottom row is lever setting.
It is a practical tool as well as an artistic medium which helps the audience follow the action and enhances the overall look and feel of a stage production. References Sheehy, Helen. All About Theater . Hamden, CT, pp.