i tried some under just a red 250w cfl and they really stretched a lot. if i was only going to use 1 colour cfl i would stick with the blue tbh. obviously with hps, you can just use hps throughout. the dual spectrum cfls are superb and very affordable.
like i said, it works fine for me. take it with a pinch of whatever you like, it makes no difference. and i'm not new to the forum, i've been a member for over 3 years.
i totally agree with this. you will occasionally get a very small or unusual looking plant, they are all individual. that plant is small but it is a nice looking plant actually. i once had a 10 inch california orange plant, highly irregular but very nice main bud.