Eddoron,
Lots of indirect lights, and ceiling is actually made of sector ones (we found the result quite convincing)+ light mats. This is an office ceiling.
This puts the cursor way out of 250 lights.
Beanzvision, i know, it is not that much, but this came out good on our latest scenes (not using corona lights) but rather light mats alone.
Things is we found the use of sector lights much convincing when coupled with light mats.
Thanks for your answers,
TomG, i'm not sure the splotches comes directly from the high number of lights.
but after many tests trying adjusting the render settings parameters we did not find our way, and they still remains.
so, would you know a way to get rid of this splotches? or lessen them?
thanks in advance,
Nelaton