Thanks!!!! I personally haven't used them yet. But i have a buddy who pulls 14 pounds from eight 600W Gavitas on a regular basis!!!! But to me the gavita's are all pluses!! I really don't see them being anymore expensive than a standard 1000w setup. Found a online place that sells them complete for $447 with free shipping!!! Even if you take the added benefit that they claim 8-10% better crop because of better PAR than all other 1000 watters out of the equation. No other ballasts out there are as reliable. As well as no other reflector has more engineering behind than the gavita's. No 3 phase power. Just 240 volts single phase.