i love my leds but i'm behind the times. i run a area51 rw75 with two vero 18 cobs in one box and 12 vero 18's in the other box. the newer strips and quantum boards are the way to go now. check out the link. i think the strips are better cause you can adjust them so you don't have bright spots. the q boards are killer as well.
I have to agree with @giggy I built my last light using Horticulture Lighting Group 4X QB132 Quantum Boards (3500K) No longer avail better ones are though.
I overdrive it to 300watts true power from wall.
Not hard to do, Price was not bad either.
I must say they blow away Mars Burple Leds and most other HG bulbs I have grown with. (low heat less power less worry, I had a grown bulb explode in my face yrs ago , scared the crap out of me.)