Tony Harris has set up a resource for users for VrayforC4D, and here he shows how to use the V-Ray Light Dome effectively in Cinema 4D, and shows how to use an HDR for lighting with the Light Dome. Tony has also created a facebook group for everything that is Vray for C4D, where you can post questions, pictures and share files.
VRAYforC4D is a product created by LAUBlab KG Vienna who licenses V-Ray from the Chaos Group and adds their Cinema 4D integration (V-Ray Bridge) to it and then retails VRAYforC4D for around $980.00 US for c4d 11-5 to c4d 13.0. When you purchase VRAYforC4D you also receive support from LAUBlab as well as the Chaos Group as you have in essence purchased a standard license of V-Ray.