HypoTek Dimmable Electronic Ballast-600W - 120/240V HypoTek Dimmable Electronic Ballast-600W - 120/240V (490600)600W Hypotek Ballast Digital 120/240V Dimmable- Dimmable to S-Bright 100%, 75% or 50%. Digital Ballasts are more efficient and quieter, emitting an average of 15-20% more lumens than magnetic ballasts. More lumens equals bigger yields! Digital Ballasts also produce more natural light. Operates both MH and HPS lamps. Intern... Note: Lamps / Tubes are available separately. — Ships from DL: Livermore, California USA....more info.