Hello everyone, I am relatively new into Unreal Engine and I am wondering why there is always this light flickering when i am moving around corners or entering new Rooms. I have tried to find similar posts with this problem but havent found a solution yet. If someone can help me, i would like to thank you in advance 
Make sure the lumen debug views under lit matches the scene well. Make sure any emissive lights have mesh distance fields enabled, and emissive light source checked on the details panel.
see if it does it in game - that looks like it might be an editor effect to me
You have two things going on:
- Pop-in from occlusion culling
- Ghosting from Lumen
To some extent ghosting with Lumen is unavoidable but I think it’s being exacerbated by the occlusion culling. This issue (and mitigations) are discussed in one of Epic’s livestreams:
Timestamp: 32:18