Xtrasun e-Ballast 1000W Dimmable 120-240v – IncrediGrow Garden Centre
SunStream 600W Double Ended Dimmable Electronic Ballast for Grow Light
Solux dimmable electronic ballasts
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