1000 WATT HPS ONLY SWITCHABLE 120/240 VOLT ELECTRIC BALLASTS “SUN SYSTEM” BRAND (3 IN STOCK) by Ray | Oct 20, 2016 | Growing Supplies | 0 comments Electric Ballasts. Mint Condition. With Dual input voltage easily switch between 120 and 240 volts! We have 3 in Stock! Submit a Comment Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.