^^^i agree, thats a good way to put it.Cut all the lower shoots that don't receive light.......they might make it pass the screen but by then the tops will also have grown....they will shade those lower shoots and you will get lots of airy nugs in the bottom......
Don't worry and don't fuck with them too much. I would cut off any lower branches not in the screen yet. It will let the top budz get bigger. I would be worrying more about the light you are using. 1000w HPS all the way!!!!! gl, your grow looks good.
Should I thin out the bottom as soon as possible before I get to far in? Ive read that alot of peeps say dont cut anything off.