PAR-TEK LIGHTING 600W Multi-Wattage Digital Ballast 120V/240
Mari Factory Direct Supply Luxpro 600W Digital Ballast HPS/Mh Grow Light Soft Start/Rj11 Smart Controller European/UK Hot Sales in Hydroponics - China Digital Ballast 600W, 600W HPS/Mh Grow Light Ballast | Made-in -China.com
Hydro Crunch 600-Watt Digital Dimmable Ballast 120/240-Volt for Grow Lights C02A011000 - The Home Depot
Lumii Black 600w Ballast Grow Light Kit Hydroponics 600w Bulb HPS Dual Spec SALE | eBay