I am reposting my notes on the test I did on lighting in v15. It is better to be here than under the ‘best image’ posting.
I tested with v15 using Recessed lights that by default have the ‘bulb’ Z setting down 2 3/8″. In the past I had it lower.
The test turned out exactly like the posted ‘which to you like best’ renders. I get no ceiling hotspot and very nice ‘soft’ light cast on walls (if far enough away)
Using Physically Accurate Lighting or having it turned off, made little difference in the light results. The room is simple and all test I did with lights / sun brightness, cloudy or sunny / or custom, shine on floor or not…. all were with in 45 seconds to finish of each other.
I used to use Recessed lights all the time, I think I’m going back to them.