[2021] Strange light effects

Hello @Ko6ka, this seems like an edge case that could be both hardware and driver related, could you try to revert back to the previous GPU driver version to see if the issue persists?

You may find older drivers through the advanced search on Nvidia’s driver page:

https://www.nvidia.com/Download/Find.aspx?lang=en-us

Additionally, do you have any other Unreal Engine 4 titles you could test with the current up-to-date driver to see if you experience similar issues?