For me, high density SOG is the best way to get high gpw numbers. I love verdant's modular SCROG and have seen it done before on a larger scale, 9 plants on a square metre, each plant filling a 30x30cm screen. SCROG is simply impractical for larger commercial grows. Sure, one guy with 6 lights can manage a SCROG, but more lights and space than hat and you wouldn't be able to keep up with the tucking and tying, SCROG is the ultimate in high intensity growing so is suited to smaller spaces.
High density SOG can pretty much match SCROG for yield and has the added benefit of needing no veg time. The way to do a high density SOG is to take your cuttings as soon as they are rooted and plant them out, I prefer small 10cm square 1.5 litre pots of coco. I put 81 (9x9) or 100 (10x10) on a square metre and grow the plants single cola, pruning off any branches. With 100 plants on a metre, you only need each budstick to weigh 6g dry and you have your 1gpw figure (given one 600w light per metre). However, there are many strains that will produce way more than 6g grown in this style, 10g per plant is a kilo per light and that is very possible with many strains.
hi indi - i see your point about doing scrog on a large scale. you would certainly need to be on some kind of rotation system whereby the first 2-3 weeks of training and tucking were staggered so as you didnt have to wrestle with a whole roomfull of plants at the same time. my main love of scrog is that it keeps my plant count right down.
as for veg time that can be a problem - the 1.4 gpw cheese plant was vegged for 6 weeks or so to fill a square foot with colas
but some strains, such as my blueberry only need a couple of weeks. i find a big repot - say 1gallon to 4 gallon, at the point you fkip them will produce explosive growth with many strains that will fill the screen during stretch.
VG.