The AGS brand digital ballast is designed to light both HPS and MH bulbs. This ballast gives you more lumens generated per watt than magnetic ballasts, and runs quieter and cooler. The electronic starter gives you fast start-up to reach full brightness quickly. Comes with a standard 120 volt cord, but has the option to run on 240 volt as well. A dimming knob allows you to select the output of your bulb; 50%, 75%, or 100%. Comes with a 3 year warranty. Available in 250, 400, 600 and 1000 watt.