if ur building them and want to go with 1 of these technics, make sure to have lateral room, as hieght is less important... my plants r like 18inchs where if i grew them straight up they would be 3ft+... u can also use less plants this way to acheive a larger canopy and make the most of ur lights u pay for... i have 7 plants that fill a 4X5 area... and they "fill" it as u can see