Unity's Default Light

How do I access Unity's default light settings... Like turning it off. I'm trying to have my scene fade in. I can animate my light but i realized that unity's default light, still lights the scene and I can't get it completely black.

http://unity3d.com/support/documentation/Components/class-RenderSettings.html

http://unity3d.com/support/documentation/ScriptReference/RenderSettings-ambientLight.html