Yes, I was running multiple tests. I was cranking up the reflection samples to 128. That’s the maximum. Nothing. It’s not changing.
I noticed, that some of the flickering disappears when I turn off inverse square fall off… which is only available for the spotlights.
But heck… then the lighting values are all off and of course, the light source doesn’t look as nice because you don’t get this natural fall off.
But until yet… no way to resolve this issue. 