Nice, what render engine did you use?
Thanks Nathan! I used Rhino Cycles, though there do seem to be a couple of artifacts in the lower left.
Cool. You probably can get rid of them by using Indirect Clamping, set it to 3 or maybe even a bit lower. You probably don’t need to set the direct clamping, but you can of course try.
Nathan, clamping definitely helps, the artifacts are gone. Rendering, unfortunately, is a field in itself. Thanks for the suggestion.