Sylvania makes one and so does sun master. There is not much call for them most of the light bulbs are for industry applications and we just use those.

There are several digital ballasts that are 600w and run either Mh or HPS lights.

That's why I saw no point is this question.

It's very rare for anything to be developed just for growing pot. We get most of our products as cross avers from other industries.
Zandor Reviewed by Zandor on . The Great Mystery Of The Cultivator I never figured out why they don't make 600 Watt Metal Halide Grow Lights. Anwser that question and you will reach godliness. Rating: 5