BApollo Horticulture 400 600 1000 Watt Hydroponic MH HPS Grow Light Dimmable Digital Ballast - Pick Your Wattage ReviewbP PP Apollo Horticulture 400 600 1000 Watt Hydroponic MH HPS Grow Light Dimmable Digital Ballast - Pick Your Wattage P1000 Watt Ballast Adjustable at 100, 75 and 50 for maximum efficiency, Up to 30 more lumens than magnetic ballasts for improved yields, Compatible w both MH and HPS bulbsPCompatible w 120V and 240V power supplies (We include a 2 meter 120V chord), High frequency output results in less power loss (5060Hz Frequency), 99 Power factorPShort circuit protection by automatic power shut off for ultimate safety, Fast lamp ignition by lighting up the bulbs within 1-2mins max, Stable light output by constant lamp voltage, lamps will be flicker freePBuilt in cooling fan and Graduating fin design to minimize ballast temperature, Light weight (Under 10lbs), CE certified and UL listed. Each Unit Includes a 3 year Warranty.