SunStream 600W Digital Dimmable Electronic Ballast for HPS/MH Grow Lights Fixture, 8 FT Power Cord Included - Efficient and Reliable Indoor Plant Growth : Amazon.ca: Tools & Home Improvement
GrowBright Professional 1000w Switchable Ballast | HTG Supply
SG Ballast 1000w Convertible Magnetic 120 / 240V – Grow Me Green Inc.