Phantom 750W Digital Premium Ballast, 120/240V Dimmable with Input Voltage: 120V, 208V or 240V Our Phantom Digital 750W Electronic Dimmable Ballast is part of the most rigorously tested ballast line on the market Dual resettable breakers - protects lamp and household circuits Three operating configurations - vertical, horizontal, or hanging Drives the highest light output for maximum plant growth Phantoms feature silent operation, lightweight design, and the maximum lumen output on the market. Silent operation Exclusive Lock & Seal BAREF lamp cord installed Internal RF shielding Triple surface aluminum fins and elevated rubber feet provide the most efficient cooling in its class The Phantom is also the only ballast on the market designed for vertical operation, for coolest running and optimum grow space. Internal resin coating protects components for long life CSA-certified Generator ready The 750DS runs HPS bulbs only (High Pressure Sodium) Input voltage: 120V, 208V or 240V