It was a light source, since to get light with vray, if you don't want to use actual lights, you have to use a bright color, kinda like a real life light, its just a bright(kinda hot though, lol) color that illuminates a room/area/etc.
I use a rather expensive(well atleast to me) screen recording software called Camtasia, there is another one that i've seen some people use called hypercam, though i've never used that one before. there should be demos of them on the company's website.
i installed vray for c4d a looong time but couldn't get it to work, kept getting a little gray box when clicked render. Ye the pic was bright lol I just did it real quick to show you what i meant, but why did u stop rendering the cars in vray though seems like you know the settings real good?
yeah from time to time, the best way to go is sell bundle sets, then also sell them individually, but make the bundle sets like 3/4's of the original combined pricing and what not. i've got like five models i've still gotta put up.