You're referring to the color being picked up? There's alot carrara can do, but if that's the only thing you wanted...you may be out of luck. I think you would have to fake it w/ multiple lights...it can't currently do that.Go put it on the wish list...enough people chime in. They seem to listen.I know lots of people would want this whether they have said so or not.More realistic lighting IS important. Post render for a 3D program is not the right approach.Carrara's strength is it's rendering...they pride themselves on their lighting accuracy so I agree LCBoliou. In this case with the light cone which is not post render, since I think version 2, there should be no reason that the ability to pick up the shader color cannot be added, I just think it was overlooked.

No need to think outside the box....
    Just make it invisible.