Lighting designers know how to make the best use of the subtle and powerful medium of light, creating effects that can be changed at will to match the mood of the action. The Lighting Designer at work At its most basic, stage lighting functions to make the actors and their environs visible to the audience. But it can also be used to: 1) Evoke the appropriate mood 2) Indicate time of day and location 3) Shift emphasis from one stage area to another 4) Reinforce the style of the production 5) Make objects on stage appear flat or three dimensional 6) Blend the visual elements on stage into a unified whole.