hmmm, first off, i have 2 CFL on my plants and there growing nicely and very compact. The reason being is that the lamps are 1-2 inchs from the surface of the leafs....It seems that your plants light source is too far away since the internode lengths are long. Put the lamps much closer and you will see a great difference in growth. Get a desktiop lamp ($10), there great and very adjustable.