new to growing

ok i have 4 plants no idea on the type got them from a bag. i am using 2 300 watt lights [about 12000 lumins] and 2 cfl lights . my plants are about 3 ft tall im at about 2 1/2 weeks flowering i used soil and am currently using 15 30 15 fert. what can i do to maximize bud growth. my plants streched some at first but now there about 1 inch apart any suggestions

What you are using is ok for the early stage of flowering, as you advance and you have added weight through flowers, lower the N and up the P and K, in the final stages I cut out the N almost completely. I assume the one inch apart is in reference to the node stretching, sounds good.

What kind of lights are the 300 watters?