You are going to need some HID lighting if you plan to flower those. You say you have been growing them for 3 months?? Those plants should be about 3 feet tall by now. Maybe 3 weeks? I think you need to upgrade your lighting. The more watts of HID lighting you can get on them.. the more they will yeild. Get a good 600w or 1000w HPS and they will yeild very well... asuming you do everything else right.