Quote Originally Posted by bigsby
2x 600w are the way to go. Considerably less heat and much better coverage. Plus you can get one ballast to drive both lights. The efficiency gains are considerable. What kind of ballasts are you running? I'm about to pull the trigger on a Powerhouse magnetic 400w HPS. Best quality ballast as far as I can tell. 8 year warranty.
I am running the 1000W switchable powerhouse ballast, 8 year warranty. Nice and quiet, low vibration, old school reliable in my book.