2x- 1000W SE HPS, somewhat dialed in with only 1 previous grow under the belt and its possible to net 4lbs from a 4'x8'. (Been there. Done it.)
Its not that difficult, but even for 1 (4'x8') with 8 plants, it's a lot of work. The devil's in the details, and to take care of all of them properly takes a bit of time.
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It might do you best in the long run to do a small 4 plant grow to understand "how" to grow before taking on 8 tents and 10lbs.
Whatever you decide I wish you the best. Make sure to start up a journal once you get it all up and running.
Oh. It's real easy to go to the grow journal section, look up people who are giving you advice, and figure out who it is you should listen to. A few who helped me out have given you some pretty good advice. Just make sure the people giving it to you know their shit.
Pictures or it didn't happen.