Problem with lightning in corners.

Hi I’m new to Unreal Engine and I have a bit of a problem with the lighting in my scene. There are weird lighting artifacts in the corner of my room that just don’t go away.

I’m using Lumen.
The walls have thickness and double sided lighting.
I’ve tried to turn of ssao and bloom.
Cant find the same problem anywhere.

Hey, try to add some planes so their normals are facing the light source outside the room where the artifacts are appearing, and tell what is the result. It looks like your room normals are facing the wrong way outside it.