not a light issue, unless its the distance...i have kept mine 12-18 in away from the tops of the plants. I am a dirty guy, so I dont know if any of your hydro issues are wrong..But i know a few things about growing with that light:jointsmile:
At 18in away from the tops of the plants, them being 6in tall, i would say you have good light for 2' x 3' in your closet. are the buckets pushed together? and you need air to change, not just circulate.
hope that helps man...good luck!
:smokebong:
whiskeytango