Sorry, I thought both were related to the personal light. I also remembered something today I did on accident while trying to figure out how to export msh files from 3ds max. So the client renders things in different "worlds". Everything outside renders in the outside world and if you cut a hole in a building, you can see right through it, but not inside it. Each room inside a building is its own world also.
So lets say I take foyer 2, and 3 of the starport and stitch them to foyer 1 msh file. I then go through and erase everything in the foyer 2 and 3 msh files. Still have to keep them because the server says so. Boot up the game. As long as Im in foyer 1, the personal light will render into the stitched portions of foyer 2 and 3. But as soon as I cross over into what the server says is foyer 2, the stitched room disappears and now I'm standing in the erased foyer2 msh file room. I can still see into foyer 1, but the stiched room is gone until I go back to foyer 1.
So how does the game determine when it should generate a new "world"?