The user who reported the issue has provided a video that also shows the issue: 

[Link Removed]

Steps to Reproduce
  1. Open attached project
  2. Move camera back and forth while looking at lights

Result: Blocky artifacts appear around the edges of the lights radii. Depending on engine version, making the editor full screen or windowed will make the artifacts appear or disappear (see attached GIFs).

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Affects Versions4.
Target Fix4.21
Fix Commit4089335
Main Commit4358751
Release Commit4399518
CreatedMay 11, 2018
ResolvedMay 30, 2018
UpdatedOct 2, 2018