Horticulture Electronic Dimmable 1000-Watt MH HPS Digital Grow Light Ballast. Dimmable Electronic Ballast powers both High Pressure Sodium (HPS) and Metal Halide (MH) bulbs for vegetative growth to flowering stages. Run your hydroponic grow lights brighter with this ballast as it supports dual voltage 120v/240v. Automatically converts between HPS and MH Lamps. Built-in cooling fan to run cooler than other digital ballasts. Easy Adjustable Power Settings of 400W/600W/1000W/Super Lumen. Allows 50 Hertz to 60 Hertz. 1 x Electronic dimmable 1000W digital ballast. 1 x heavy-duty grounded power cords 3-prong 120V plug. DOUBLE ENDED REFLECTOR & SYSTM. The item "Horticulture Electronic Dimmable 1000W Watts MH HPS Digital Grow Light Ballast" is in sale since Wednesday, February 18, 2015. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Hydroponics\Grow Lighting & Accessories\Grow Light Ballasts". The seller is "digital_grow" and is located in Ontario, California. This item can be shipped to United States.