3x400w growroom setup questions

I want to run 12 bubblebuckets in a 2x6 space (which is about right for my wattage) packed together in 2 rows of 6, maybe a little over the mark if the plants are grown out, say 2.5x7ft. I have no restriction on vertical space.

The question is how long, or until how many nodes should i veg? Hopefully I will veg from clones all the same size but I might not. Would a screen come in handy here to keep everything at the same level? I was thinking of vegging the clones until they re 5-6 nodes tall or is this probably too much?

I'd like to veg out the plants a bit. I dont want to flower little clones.

I might run a Scrog, top, or both. I was thinking of topping each plant for 4 colas with the possibility of adding a screen. Would scrogging increase yields? Should I train at all?

I will be running different strains. C99, White Rhino, Jack Herer, Super Silver Haze. These plants all grow differently and at least one of them grows notoriously tall and lanky like sativa so this has to be bore in mind.

I also have a 400w metal halide bulb I can use instead of an HPS. Would this be useful and where in the garden would I place it? (im talking about flowering)

I'm also curious about UV lighting and what kind and how much of it should I use to supplement 1200w or 3x400w HPS lamps?

Peace

Take a look at jigfresh's DWC grow journal. He has EVERYTHING documented on how and what he did. The questions that you've asked in your thread could be answered by him, he's full of great info that could help you out. Good luck

a screen shouldnt be used if you have strains that need more flowering time,you may run out of space from the taller growing sativas. may i recommend those tomatoe stands? you can train a plant any way you like, the have metal rings and you can let each individual plant grow throw them

3 hps, you'll need a 3x7 space, the extra half foot on th width wouldnt matter.
im not sure how many plants r in the bubble ur talking about but i would go more then 4 plants under each hps, you might find a better grow with 2 600w HPS 6 plants under each in a 4x7, gonna try n hit the 24-30oz mark...