Setup
Setup - Set up the screen size or number of passes, and click the Refresh icon ( ) to re-render the model.
Lighting defaults
Click one of the Lighting Defaults icons to select a lighting default and re-render the model.
Exterior - turns on the sun and the sky, and high ambient lighting.
Interior w/sun - turns on the sun and the sky,
and lowers the ambient light so interior lights will be effective as well.
Interior - no sun - turns off the sun and sky, with lowered ambient lighting.
High Dynamic - Uses an HDRI sky for reflection and illumination.
This provides a nice lighting effect for viewing individual items.