This poses an interesting question. I have visited a number of restarants that use there rustic light fixtures that looks like it consists of homemade materials. One in particular is an upside down metal pail with what looks like a wire guard from a HID fixture. The lamp socket is attached to a fabricated box afixed to the bottom of the pail and suspended from a down rod. I saw no listing labels. How can this be? Are there exceptions that can be argued with the AHJ when these restarants are built?

Blessings, Mark