Light is a precious gift seen everywhere. There are three criteria where light can be adjusted- Brightness, Colour and Type. A place where all three of these qualities are used together is Stage. Light has certain inherent properties that affect the eye and brain processes, so the lighting designer's contributions to a piece of theatre/stage provide a vital sense of realism, mood and tension. The best lighting is what seems most natural, and often goes unnoticed.
(1) SELECTIVE VISIBILITY
The 1 function of light is to see. The purpose to selective Visibility is that the audience is only viewing one thing at a time. If you are watching a musical event and someone is singing a solo, the attention needs to stay with the singer. A spotlight will be used for this. The audience should see only what the director wants them to see.
(2) MOOD SETTING
Lights are the most effective way to set the mood or tone for a play or for any given scene. The mood helps to direct the audiences' emotions so that they may feel what the director's motivation of the performer to convey, through words, actions, etc. For example, a high energy dance scene may make use of a multitude of bright or flashing lights on the walls and ceiling of a venue, but spotlight might be used for the main performer.
The lighting is intended to emphasize the flow of the story. As moods change constantly in a production, so does the lighting and it is important to make sure there are smooth transitions. The light operator has to make sure that a move from one scene to other should be done in a way that is not even noticed by the audience.
The illusions created by a good lighting production can add a lot to the believability of a production. Lighting can help a stage production seem like it is raining, storming, lightning, snow, cloud, gunfire or other effects. It is important that the lights be set correctly to achieve the desired effect.
(5) REVELATION OF FORM
Similar to selective visibility, the purpose of revelation of form is to shape an object with light. The lighting is intended to make the performers, actor, dancer, or speaker stand out from their background. The lighting designer creates an environment for the dancer to move through.
The combination of all of these elements helps to bring life to the play. It is the overall effect that gives the performance a polished look.