i keep four mothers four feet away from a 400w mh. works great.
otherwise, one 23w cfl per mother.
moms don't need much light; as a matter of fact, you want lesser light to encourage stretch for good slips. i keep mine in a 6'' pot for a year to a year and a half, and just put them in a back corner of the grow room somewhere. every other week, i prune them back to 12x12x12 inches, regardless of whether or not i need the slips.
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