The Global Greenhouse Lighting GGL1000IVD Digital Ballast is a 1000W dimmable ballast that is compatible with High Pressure Sodium Lamps (HPS). It has dual-voltage settings of 220-240V and 120V, and comes in black color. The ballast has three dimming settings of 100%, 75%, and 50%. It is suitable for HPS lamps and has been tested for quality.