These lights are UL listed for Class I, Division 2, Groups A, B, C, and D for environments where ignitable concentrations of acetylene, hydrogen, ethylene, and propane occur infrequently, such as in the case of an accidental spill or failure of a ventilation system. They can be hardwired to operate on any of the voltages listed. They require a metal halide bulb (sold separately). These floodlights cannot be sold to California due to local energy efficiency regulations.