this is the scene that these renders are done in. the big ball is 100% ambient white, and about 4 times the size of the car. and about 4 times the hieght of the car above the ground. the white plane is also 100% ambient white, and sits just below the ground plane (which is used as a shadow catcher) this is a well known trick used by the pro's when rendering cars to give it a nice shiny sharp reflection. Ill take some screens of the material and post it soon

TemplarGFX
3D Hobbyist since 1996
I use poser native units

167 Car Materials for Poser