Alright pal your girls look pretty healthy to me mate. I'm not sure what the spots are but doesn't look to bad so dont worry to much, unless it gets worse then seek help. Think you should maybe put your pots in a square under the light and leave the runt on outside so the best girls have the best light. It does look like they are stretching slightly to turn inwards towards the light so if you do that and try lowering the light a couple inch's, see how they react and if they turn up toward the light that should be about right. Like others have said before me "Its all about trial n error mate. All looks well to me now though chap.