Reef Brite Digitally Controlled MH Ballast 400WThis energy saving, water tight solid state metal halide ballast will provide years of maintenance free use. With a lower operating cost, Reef Brite ballasts use less power. Built in microprocessor constantly monitors the lamp and other components to keep the entire system working at optimal performance. Available in 150 175 250 selectable wattage and 400 watt (Non selectable) This energy saving, water tight solid state metal halide ballast will