Glad this thread was started. Started reading into this stuff last winter. Going to try and master it this winter so I might need to pick a few brains. I actually have a few esp and maybe an onion lying around somewhere. Look into the onion if you guys havent...incredible.
Been using it for the last few grows and I love it. The only thing I add is light feedings of fish ferts. High N for veg, high P for flower, of course. I usually use only Neptune's harvest but switched it up a lil and use Earth Juice grow for veg and Neptune's Harvest rose and flower for flower.
Using a combo of hps and COBs. Not even the best COBs. Some cheap ass citizen chips. Only difference I can tell from using 2 400w hps vs 1 400w hps and around 400w of COBs is the heat. Lot cooler with the COBs.