so you dont think a 600watt mh/hps would be enough?I'd say you'd be fine with a sativa strain that doesn't bush out too much. You should get a 1000w light or lots of t5 side lighting to get light to the lower buds, though.
What if he lollipops them in order for the light to penetrate right around all the plants, could that work to his advantage? Just a thought.Depends on what you want. A 1000w will penetrate into a deeper, denser canopy. You could have a larger yield/plant.
The spacing is really too close for really bushy plants, so you'll need to keep them kind of small if they are bushy indica strain, start 12/12 pretty early. Thats why I recommend the lankier sativa plant with a deep penetrating light or probably better yet, the t5ho side lighting with a 400 or 600.
They grow really fast in this system. Good luck.
What if he lollipops them in order for the light to penetrate right around all the plants, could that work to his advantage? Just a thought.