@Hybridway thanks for finally recommending something finally lol.
@CobKits what led's are you aware of that top 75% of the wattage of HPS as per your previous post?, I also do not have a predefined budget as long as the light outperforms the HPS by considerable margin I am willing to buy it.
My only advice to you whatever you decide to use to replace a Gavita is to buy or build one first. Whatever you decide. I'd try 2 or 3 of your favorite possible decisions. Then try them out side by side against your Gavita to see if you're happy before all this 50 light replacement action takes place.
That's what o did before going all in. Glad I did too cuz some of my lights rocked the other ones with a substantial increase in yield. In a 4'x4' my Amare yielded 3x my other light of comparable cost.
That's 100's of thousands $ over the course of 2 yrs if they were in my larger room.
Just try what you like before you go all in.
BTW, the Pro-9 would come with quantity discount pricing. Prolly right off the rip if you talked to the owner n told him your future intentions.
Good luck!
Beware of advice from guys who've never grown under HPS or other LEDs aside from their DIY builds. Guys tend to build a light for their lil tent n think they know everything. No offense to those who don't act that way.