The lighting actually is just a hdri file (17Mb in size), that surrounds the scene and lits it, an hdri file being a kind of light-emitting real life image (there are no lights in the scene). But you can only use it in Carrara 3. I thought you were using that. There is a nice demo on the Eovia site. A light dome around your scene can be an alternative (a large sphere, sometimes with an open back to stay out of frame, surrounding the scene with a huge amount in the glow channel, by multiplying white with a scale of, like 1500%), you can find information about that around here. I never tried it, so i do not know a lot about it. If you have time and a bit of a fast machine you can experiment with different light and render settings (and 'ambient light' settings as well) to see what works in C2. Keep up the experiment!