Colored lights and reflections.
What did I learn?
I am using 3ds Max in combination with Vray and I noticed that when using reflective materials it is best to put the subdivs of the reflections on a minimum of 16. Othewise there will be too much noise.
I also learned that you can add detail at a low cost in terms of render-time when you add some bump maps here and there. There are little lines visible on the central column. These are created with just a simple bump map.
I decided how to arrange the lights by making a clay render first and adding and substracting lights from that. You can not only work faster this way, the lights are also much more visible.