I'm trying to achieve photorealistic renders with Image Based Lighting + lamps that should effect the scene locally - only the surfaces around them. In this particular case, the first render was made with IBL + only the one spotlight lighting the logo on the wall: with 60 samples I get close to the result I want.
However, rendering with the rest of the lamps, 1-2 hundreds of point lights that should only effect the surfaces immediately around them (to achieve that I have set their max bounces to "0") noise gets totally out of control in the area lit by the spotlamp. The area lit by the spotlamp, the wall with the logo, should not be effected at all by the rest of the lamps, only by the spot and the IBL, so I wonder why the noise?
Is there a way I can reduce noise taking advantage of the fact that, although I have many lamps, I only need them to have a limited, local effect on the scene?
I attach two more images to help you understand the scene. I use cycles, blender 2.75