Waterfarms are great!
I've used these for years!
However my 2x4 ebbnflow gave the same results in less time. But then again your talking more plants.
Maybe about 3 years ago, I had a mom that was roughly alittle over a year old. 2 of them to be exact. I had to let one of them go due to space restrictions. well when the end came (harvest) I pulled just afew grams shy of 1lb. under a 1000w hps, hangin on a light mover that made it's way around to the otherside of the garden (where she was) every 15 min. Thats not to shaby at all!
The other side of the garden had roughly 20 smaller plants, and it's own 1000w, that gave me about the same in weight.
The strain used was white russain.
Of course with the proper care, and ebbnflow can hold a single large plant as well...with easy!
I still have an old megagarden that could perform like it came from the heavens