UL is the most respected name in product safety in the United States. Using UL's strict traceability guidelines, all components of a completed product meet or exceed UL's quality and safety standards. When a lighting fixture is UL Listed, it means the final product has been tested and certified to UL standards. It then gets a UL label on the backside of the canopy indicating it has passed. To see if an Illuminate Vintage fixture is UL Listed, look in the title or description of the listing. Note that fixtures with movable joints will not be UL Listed, but will be constructed with UL Listed electrical components.