Not really read the rest but if it was me id have 2 lights on 2 plants. If 1 wasn't enough for 2 then it will be the same with 2 for 4. I tried to do 4 plants in a 80x80x160 and i didn't have enough room, even 2 gets cramped in my tent. You will most likely need to upgrade your tent for 4 because it will be way too cramped and you wont get the best out of them.
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