I am running a 11 plant aeroponic system. During Veg stage they all looked really healthy and very little roots developed andnot much growth in hieght but very healthy looking. I then changed to te 400watt HPS light, a few days of 85-88 degrees. I now have it at 74-76 degrees. 35%-42% humididty. I have the HPS light about 24" above the plants, 12hrs on 12off. I cut the clones 3"-5" tall and (1) @ 6" tall. Two of the clones droop and leafs curl when the HPS ligt turns on and most of the plants leafs curl down slightly, not much! When they sleep they perk up and look really heathly. I also havent seen much growth in hieght, but i do see new small leaf growth, and small crystals are developing. Any input or does anyone know what to check for or ideas to help with growth. I did add the Sweet to the feed mix. I have had the HPS light on for about 2 weeks now and not much root growth.