iPower GLBLST1000DX2 2-Pack Horticulture 1000 Watt Digital Dimmable Electronic Ballast for Hydroponic HPS MH Grow Light, 1000W, Black

Support dual voltage input 120V/240V; dimmable options: 50%, 75%, 100%; (8 feet heavy-duty power cord included) High frequency output results in less power loss, 30% more Lumens than Magnetic ballasts for improved yields Automatically converts between HPS and MH light bulbs by micro-chip programming; Fast lamp ignition by lighting up the bulbs within 1-2 mins max; Stable voltage output ensures flicker free light Ultra-safety: protection against short circuit, power Surge, ignition failure, Overheat, end-of bulb-life; built-in cooling fan and graduating fin designed to minimize ballast temperature