UE4 4.16 update: with this update Epic introduced some changes that greatly exacerbate eclipse effect. 4.16 compatibility will be added once I will figure the root cause of the issue and provide new settings to replicate 4.15 effect behavior. At the meantime please avoid converting your 4.15 projects with StarSphere in-place to the 4.16 version.
The issue is due to Power node behavior change.
4.16 compatibility will be up once StarSphere update will hit the marketplace.