Hey @comlys , no I only use sky and sun… when I delete the anti aliasing setting completely in MRQ then the fireflies/flickering are gone. In lumen and in pathtrace. But I can’t use it because I have to tell unreal how much samples I need to render. It is very strange. I am now on holiday but when I come back I can make a sample Scene and make screenshots that you know what I am talking about. 
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