By dont flower them for too long I mean, as it stands now the plants are in their Veg cycle. And will remain that way until you give them any less than 16 hours of light. A good Veg cycle is usually 18 on and 6 off, where as a flower cycle would be 12 on 12 off. The longer dark period promotes flowering. But with the way CFL's flower a plant it can be very deceiving. The buds dont grow very big so often people will let them grow for too long in the flower cycle and they begin to die. You have too remember when its under a light its not like outside where the plant determines its own life cycle. Once the plants are flowering they're not far off from dying. Thats why its important to not wait too long but not to get impatient either. You'll notice the buds at the bottom of the plant starting to brown abit before anything. If your the kind of guy thats gonna wait until that point I guess thats when you'll know but for me I crop down and restart after 1-3 months at most of flower. And 3 is REALLY pushing alot of times I find myself only doing 1, 1 and a half. Its all about the feel yknow? Comes with time and experience. Eventually you ll just know when its ready. Kinda like cooking steak or a buger on the BBQ without a timer