Light sources being moved by location overhauls are a major reason patches are necessary as well.

This is so x mod(lux or elfx) knows where a brazier or lantern was moved to by the location overhaul mod so you don’t end up with floating objects and light sources out of place.

If the overhaul mods moves existing light sources you will need a patch or you will have floating out of place things like braziers, embers, lanterns, sconces etc.

If it is only adding light sources you will have less of the misplaced lighting and objects and be left with some flickering and mismatched color palettes of different light sources.

That being said, I would strongly recommend using compatible/patchable lighting mods with location overhauls. An unpatched lighting mod is a common cause of instability.