THUNDER (TM) Horticulture TBF1000 Hydroponic 1000 - Watt HPS MH Digital Dimmable Electronic Ballast for Grow Lights + FREE Thunder SureGrip Ratchet Hangers Includes 110V Cord (2 Ft Long) and CE Certified / UL Listed 1000 Watt ballast features a high power factor, high luminous efficiency, adjustable wattage output, and works on 120v or 240v, worldwide compatibility! Compatible with HPS and MH bulbs. Lamp Dimming Option From 50% / 75% / 100% with extremely 99.9% Efficiency Most forgiving power-source. You can run lights up to 65' away from the ballast and this ballast will increase lumen output by a whopping 30% without using anymore electric over traditional ballasts! 5 Year Warranty that is equal to the best in the business. Coupled with the quality construction and the fact that it runs 30% cooler than other ballasts, this is one of the best choices in the market.