Norman Lamps, Inc.

Commercial and industrial buildings in the U.S. typically run their lighting circuits at 277 volts, not the 120 volts you have at home. These bulbs handle anywhere from 120 to 277 volts, which means they work on those higher-voltage circuits without needing a transformer to step the voltage down. That's one less piece of equipment to fail, one less thing to wire, and a cleaner install overall. If you're outfitting an office building, warehouse, retail space, or any facility with 277V branch circuits, this is what you need.