IMO a single 1000 is only good for a 5x5 area but 6x6 will work. The light on the outside edges will not be as effective that's all.

Getting the hot air out is just as important as brining in fresh air.

With a strain like AK an experienced grow should be able to pull around 2 lbs. per 1000 watt light. If yer new expect around 1.5:thumbsup: