This item is discontinued. We recommend using the alternative Xtrasun 1000w Convertible Ballast HPS/MH 120v/240v. Reliable service at value prices. Designed in America, employing features and materials normally found on higher priced units, these have become the most popular value-priced units on the market. Their unique patented aluminum housing with convection cooling runs so cool we offer a 5 year warranty - the longest in its class. Dual voltage Xtra versatile ... works with most fixtures Xtra value ... Super affordable 5 year warranty on ballast electrical components Aluminum fins, louvers and ports for extra cooling efficiency Compatible with all Hydrofarm reflectors and most others CSA certified: click here for listing