Heres what I was talking about

I rendered this using FINALGATHER with a poly plane for a backdrop with incandescence turned all the way up and a poly ground plane with the incandescence turned up slightly. Although you can light the scene with an incandescent plane from above I took Vlads advice and used a directional light and softened the shadow settings. Lighting it with a incandescent plane works fine but you get stronger shadows using an actual light.




Dave