I have a problem with my lighting set up.
These pics should explain the problem adequately (Note that there is a plane between the light source and the ring, so there should be not illuminated part of the model):
Any help would be appreciated, thank you in advance.
Well, I have no idea what I’m looking at, what result you expected to see or even which render engine you’re using. Please always supply a .blend file that illustrates the problem with any support question.
However, since I’m reduced to guessing, is it possible that you set the light source to not cast shadows? That alone would explain why the light from that source passes through any geometry in its way.
