As a starting point, let's go back to pretty much where we started on this project and once more take a look at the lighting that we have set up in the scene. In order to make an honest evaluation of just what each direct light source in the scene is contributing to the illumination, we really need to render them one at a time with all scene materials enabled.
To set this up in V-Ray, let's perform the following steps:
Now, any renders we take will only show us the contribution of direct light sources in the scene. Also, as we are going to be taking these images into ...