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Lightning artifacts

Hi, I have these strange lightning artefacts when baking my lights. I use a combination of movable and stationary light sources. I have a fairly high resolution for my lightmap on the walls (when i check with the light-map density mode it has a red colour). Also my uv-unwrap doesn’t have any overlapping surfaces. Has anyone any idea how to solve this problem?

  1. Make sure you are building on production quality
  2. Lightmass Portals | Unreal Engine Documentation