TOPHORT 600 Watts Dimmable Electronic Ballast For HPS MH Grow Light Bulbs. The item "600 Watt Dimmable Electronic Ballast For HPS MH Grow Light Bulbs- Tophort" is in sale since Sunday, May 23, 2021. This item is in the category "Business & Industrial\Facility Maintenance & Safety\Facility Lighting\Lighting Ballasts & Starters". The seller is "throwbacksales-etc" and is located in Anniston, Alabama. This item can be shipped worldwide.