Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 426.00
Broken: version: 2.83 (sub 13), branch: master, commit date: 2020-04-08 21:23, hash: rB1239cab11ff9
Short description of error
Dots in denoised render.
Exact steps for others to reproduce the error
Try to render the file in 2.82a (no dots) and in 2.83 (dots) as seen on this pic (I made it lighter in pshop to emphasize the difference)..
I am aware that it's not a "big" bug and it is very peculiar to these lights, but nevertheless I keep you informed.