A 600 watter is enough to cover about 12 sq. ft. Allowing 1.5 sq. ft. per plant, you can easily grow up to about 9 in 3 gallon pots, less in 5 gallon ones. Having extra light won't hurt the plants, it will just be wasted.
I started out with 17 plants under 1 600 and it worked out just fine Have far less then that now and I wouldn't go that many again but it was good feeling pulling it off.
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