OMEGA LIGHTING HIGH QUALITY "SUPER LUMEN" DIMMABLE DIGITAL BALLAST 660W-600W-400W-250W OPTIONS NO NEED TO CHANGE THE 600w LAMP ON ANY SETTING! Our Digital Ballast is not the same as any ordinary dimmable ballasts. This software controlled, variable output ballast has been specially designed to give the most selective growers the ultimate versatility and performance from a single lighting system. This super cool, super-efficient, fully adjustable digital ballast will run 600w, 400w and 250w high pressure sodium, metal halide and duel spectrum lamps and features "Super Lumen Technology" that increases the ballasts output for maximum lamp performance, giving you Monster Yields! Our Super Lumen Dimmable Digital Ballast can be used in three different ways: - Select the lamp type and wattage and the ballast will run the lamp to the exact specification that the lamp requires, just as if the ballast was dedicated to that lamp. It's like having three separate ballasts in one unit. - Reduce the output of your lamp when not so much power is needed. For example, if you are running a 600w lamp you can reduce the output to 400w or 250w. - Boost the output of your lamp using "Super Lumen" feature. This allows the output of the ballast highest rated lamp (600w) to be increased by approximately 10% delivering maximum lamp performance. Features: Dimmable Digital Ballast allows lamps of various wattages to be operated in the same unit simply by adjusting the dial on the ballast. This will run 250w, 400w and 600w lamps. Each lamp will be operated to the exact specification that the lamp requires. By turning the dial on the Digital Ballast you can reduce the output of a lamp when not so much power is needed. For example, if you are running a 600w lamp you can reduce the output to 400w or 250w. Just turn the dial again to step back to full power. The Over-Drive feature will increase the output of the ballasts highest wattage lamp to achieve maximum lamp performance.