OK, to me it looks like your lights are too high and the plants have grown tall to reach it. What type of lights do you have? If your using floresence lights keep them right on top of your plants, they dont get hot and as long as the plants dont touch them you will notice a alot more growth. I would hate to tell you to start over, so go ahead and finish them out. You will get real stringy buds but its better than nothing.
Next time ether put the lights right on top of your ladys or get yourself a true grow light, like a 400hps or a 400 metal halide. They are a little spendy but worth it. Good luck, and good growing.