My speculation: I have a interior scene here and I render a view from above like a few in a open doll's house. If I use 12 area light it looks fine. But if I use one big arealight over the whole scene, than the noise is very strong (adaptive QMC 1-100, noise threshold 0.005). Could it be a rule to avoid relativ big arealights?
first rendered with 12 arealight, than started with 1 big arealight
first rendered with 12 arealight, than started with 1 big arealight
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