Ambient and Fill Lighting
Question: How do I adjust the Ambient and Fill Lighting settings?
In the Object Library, click the "Lights" tab. The Lighting Control panel appears, and so do slider controls for Ambient and Fill light.
In both cases, simply drag the slider left to decrease the illumination, and right to increase it.
Remember that ambient and fill lights do not cause shadows; also, because some ambient lighting is almost always present in a scene, even reducing both sources to zero will not result in a total blackout of your set .