Hey guys, My first auto grow was in 2 identicle tents(3x3) Sunshine mix #4 in both tents, smart pots in both tents, and the ONLY difference in the two tents were tent #1 had a 250w MH/HPS and tent#2 had a 230w Led, and tent #2 had Cal/Mag problems by week 2!!!! So IMO it is the spectrum of Led because I ran both tents through the grow and the tent with the MH/HPS didn't needs ANY Cal/Mag supplement at all except for the bit of molasses in between feedings in both tents. Well now I have upgraded to 1 4x4 tent and 2 400w Led's and have to use Cal/Mag by week 2 on all my plants, and my temps are 78-81* and 40%RH at all times. I foliar with Heavy 16 when they are young and don't need a bunch of water, but I see those damn spots on my 2 week olds EVERY grow. So I definately contribute to makin someone's house payment, that works for Botanicare for their Cal/Mag+. I applaud everyones input and we all have to make way, that what works for me, where I am at with feed, water, pressure, environment, ect. WILL NOT WORK, where you live and your controllables. They will all be different!!! Bottom line for me is that I do not care about the whys, I will do what I have to do to make it work!!! Now don't get me wrong, if some company came out with a nute line tailored for autos with cal/mag, we would all be in line to showcase that sh*t!!!