Dave, have studied on what you had ask. If I have thunk it out correctly, I have an idea. I am doing a render right now with the lights as they were. In the morning I will lower the fixtures about 50% of what I think they were and do another render. I believe that is what you had asked.
It is wine time and to study my render.
Wish for you all a very good evening!!
Challenge me and I will try. Because If I should fail, failure also has a prize (Knowledge).