Anyone ever grown a shitload of autos?

Hey, Im considering this for my next grow.

I saw a video of 60 lowryder 2s under a 600watt HPS on youtube.
http://ie.youtube.com/watch?v=4YAMi0BMkQE

So I'm assuming 40 AK47xLR2 will do good under my 400 HPS....anyone ever done this or something similar? Can I still expect 1oz/plant?

Thanks,
Smudge