here's how I kept my three mothers alive, producing clones, and inhibited growth...
I used 2 2-tube 40W Cool White florescents standing up on end in the corners of my closet to sustain 3 2'+ plants.
this kept the nodal displacement VERY close together and they almost didn't get any bigger, yet, I still got viable clones of all plants for my current grow.
they weren't in any kind of light relecting enclosure or anything... there wasn't even a door on the closet... they were just in there in front of 4 40W Cool white bulbs. I had absolutely no probs. I simply fed worm casting juice and that was it.
you just have to keep the plants healthy and alive... nothing more.