The plants will adapt to the environment, a little training will assist them.
The plants use parts of the red spectrum to 'see' which way to grow, red light doesn't pass through foliage but far red does. If the top of the plant sees far red but no red, if thinks it's being shadowed and grows up. (That's why led keeps the plants squatter.)
I get almost the same yield from 2 plants as I do with 4 in the same space, depending on the strain, but because of the law of averages, normally have a better plant among a four plant grow. I will be running another wilma grow soon.
I found the main problem was keeping an even canopy, so I supercrop them. Keeps them even.
The wilma really is a lot easier to check, just lift the lid to access the res. With buckets it generally involves lifting the entire plant up to get to the res (you can adapt them like Wile, so you don't have to do this).
As long as you keep the air flow up crowding of the plants won't give you too many head aches.
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