Ok thanks man, I appreciate your answers. I used to read some schemes of how many watts people used per sq foot on alt.drugs newsgroups many years ago, and as far as I remember, 10.000+ lumen per sq ft was pretty extreme.

Guess I'll just try to flower 'em and see what happens. Ofcourse at those wattages CO2 and really superefficient rootmedium is a must, otherwise the extreme amounts of light will mostly be a waste.

Not surprized his buds rocked... at three times as many watts as you need and aquamist systems, they should!!

Yeah, heat will be a big issue. However I'll use digital ballasts which produce less heat, and also probably use coolshades too. If it's still too hot I'll get a bigger outtake fan. And if that doesn't make it run smoothly I'll run the flowering at night and add a huge ass intake fan too.