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The LightEnerG™ Dual Zone Real Steel Switchable Ballast is a UL approved magnetic ballast that’s capable of switching between Metal Halide (MH) and High Pressure Sodium (HPS) bulbs, as well as 120v and 240v. Changing between MH and HPS bulbs can be done by simply flipping the specialized switch. Use either the 120v (available separately) or a 8’ 240v power cord (included) to change the voltage of the ballast. No additional wiring is necessary.