Theres no secret mate. Anyone one can do it.BAHAHAHAHA....What is your secret then!? I still dont think you can get 400 grams with a 400w HPS in one plant...thanks for the chuckle though...
Btw I grow hydro using coco for medium in 2 x 40 litre tubs stack on top of each other
a 40 litres res. I use cannas line of nutes and additives
I veg using 400 hps for 6 weeks. No super cropping or lst.
Then flower using the same 400 watter for 10 weeks or until it's time to chop.
I only top her once when I flip to 12/12.
Ask any Aussie grower. You don't need to an expert in achieving
1 gram per watt.
P.s
Do you want a copy of my feeding chart?