My 400w in a 2x4x5' tent. This grow from late last year was a 24 plant, 3 x 21 day perpetual grow, going straight from rooted clone to flower. Every 21 days, the oldest batch of eight plants would get harvested, and a brand new batch of eight went in.
Plants are in 2L Coke bottles spray painted black (all drilled as Hempy buckets) in the delivery tray to make moving them around and placing my Oasis drip feeders into (the trays hold eight bottles... two rows of four) much easier . The oldest batch of plants would get two drippers each from one res, and the other 16 got one dripper each from a 2nd res. Mediums were always a mix: straight perlite, straight Hydroton, a mix of both of those and straight soil.
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-spek