Quantum 1000W Digital Ballast, 120/240V Dimmable Ballast Run at 100%, 75% or 50% power and strikes both metal halide and high pressure sodium bulbs Accepts 120V/240V with no wiring needed (both cords included); 208V-configurable with electrician assistance The most stable output frequency of any ballast, and runs 15% cooler than other digital ballasts on the market Higher lumen output than magnetic ballasts and can run efficiently on generators without flickering Resin sealed circuit board for high humidity installations and can easily be used in conjunction with lighting controllers and flip boxes