yeah does the cfl or the hps put out a high red spectrum ??? if so u dont got enough blue spectrum light so there stretching and toppling is what im trying to figure out are u using a 6500k hps or a 5000k if not u prolly got 2700k cfls or a 3000k hps bulbs which would cause alot of red light. ultra voilet red to greenish light from the cfls could cause stem growth and stretching . however green light dont usaully do much for a plant