Brilliant stuff! I've been really concerned about this because I've read the plants will stretch.Well the idea is to try to get ideal (and even) internodal spacing this is the space between branching or the nodes..for baby plants such as the one on this thread its best to have the lights nice and high if there 600w or even 400 mh/hps most tents ive seen don't really exceed 2mtrs tall unless its one of the more expensive pro tents not unlike gorrilla or the likes 400 i would drop a bit lower than the 600 but only by a foot or so. as the plants grow i start to drop them closer as they can handle it as i do this i watch for any signs as you do,of harassment by the lights like burning or excessive curling if i know theirs plenty of mag and the humidity is in check and it couldnt be anything eles. hope this helps a bit![]()