Light is not what we see, but what we see by. 

Exactly what we perceive depends upon the quality of light available.  An effective lighting system can achieve the following.

Ÿ  Set a desired mood or atmosphere.

Ÿ  Enhance a space or structure.

Ÿ  Direct attention to a particular feature or area.

Ÿ  Aid the viewer to see form and texture.