[villagetinker]

OH, this is an outside wall, sorry. If this is a newer home, you should be able to get the actual house plans from Sumter County building department. I would offer ours, but we do not have that wall. The plans should have the details of the wall construction. I can take look and see if ours references this type of wall in the notes. There may be rebar, but that is not a problem, a angle grinder with a cutoff wheel will go through that. You do realize that you will need ARC approval for this project. The post lamp wire will PORBABLY be in a conduit back to the garage. The home plans actually show the wiring so you should be able to determine which receptacle it is connected to. Hope this helps.