Yes. That is just an example where I merged all the walls together and the whole room has a 2048 LM. Ideally you would merge for example the “wall window” mesh and a standard “wall” to close the gaps. 2048 was on the high side for that specific scenario but is not the point, even a 512 comes out perfect when you merge the meshes. The point is that if a put side by side a “wall” with a “wall_window”, especially if lit by indirect bounces, a seam will show up unless I export them as a single mesh and then reimport them.