Light is an integral part of cinematography and is largely responsible for the look of the film. It can easily set the tone of a scene and make or break how "good" a movie looks.
It can also be used artistically. Light can represent a feeling or a presence. Coloured lights can hold meaning or highlight the tone of a scene.

This gallery will examine how cinematographers achieve the lighting in their films and how that light can affect the audience. http://imgur.com/a/cpLno