Well man..my light is 1200w (2x600w for better destribution) LED, i was giving her until 2 days before 1.2 but they really looked like was underfeeded..so i desided to give her 1.5..but i was wrongly watered/feeded and from now i ll give her everytime phed nuted water, and only when the surface starts to dry. as a man from above told me and as i have seen that many times at very good results(in viedeos)..she has 12 upcoming tops..she is 30 days old from seed's sprout.the problem on her was my wongly everyday W/F..i pulled out all her nutes before she eats them,with the next day plain phed water.plain phed water only if the run off is too high..soo ..from now i wait for the better progress..