Hydro Crunch 1000-Watt HPS MH Digital Dimmable 120/240-Volt Ballast for Grow Lights C02A011400 - The Home Depot
Nanolux Base Series Digital Ballast 1000w 120/240v
1000W 1150W Super Lumen Switchable MH HPS Digital Ballast 1000 Watt 240v | eBay
Amazon.com: iPower Horticulture 1000 Watt Digital Dimmable Electronic Ballast for Hydroponic HPS MH Grow Light with 200pcs Cable Tie of 8", 1000W : Everything Else