^^ I'd like to know that as well.
Did some looking around Home Depot and tried to figure out how conduit works. ha. After some youtube it looks pretty simple. One question though, the two ceiling mounted lights in the garage are obviously in a normal recessed box of some sort. How do I mount an external box with conduit knockouts to the existing box. Can you add an extension to the original? Remove it completely, patch the drywall then just mount an external box on top?
From this
to this
