SunStream 1000 Watt Dimmable Digital Electronic Ballast for MH and HPS Grow Light ETL Listed and 8 FT Power Cord (Full Version) : Amazon.ca: Tools & Home Improvement
Hydro Crunch 1000-Watt HPS MH Digital Dimmable 120/240-Volt Ballast for Grow Lights C02A011400 - The Home Depot
SunStream 1000w Single Ended MH Grow Light Bulb with High PAR for Digi
Hydroponic Supplies Light Energy EZ Switchable Ballast Kit 1000W MH/HPS Grow Store