For some time I have found the render dialogue slightly counter-intuitive, especially the order and way the options are presented. I take the liberty to suggest a small modification that IMHO improves this.
Ideally the "lens" and "add ceiling lights" options are interchanged, so that the two check-boxes line up.
Hans
PS: This was done in my word processor, and I couldn't make the check-boxes to line up properly.