So I feel like I need to give an update on the situation here as it has been almost a year since I started this room/thread. I still love these lights! Never going back to HPS! There is a learning curve with them though! Here are some of my findings on how have success with LED growing.
1. USE CA MAG AT EVERY WATERING! Even iF it is only a tsp. or two per five gallons. This is more important with certain strains I.e. OG's and Cookies
2. Over veg then lollipop like a mo-fo. This is best for me because of my SOG style grow, but because penetration into canopy can be an issue this can still be applied to larger plants
3. DEFOLIATE, some strains don't like this as much so be careful
4. If using LED's for veg, move the plants around under the light ever week or so. This is because LED's do such an amazing job of creating shorter, tighter internodes and thick stems that to get the plants to stretch a little you need to move the ones directly in the center to the edges and vice versa. This will help create that nice even canopy you are looking for.
5. If not a closed room, pay attention to weather. LED's can be too cold in winter! And they do not dry out grow medium as fast as HPS for the most part.
Take everything that I wrote with a grain of salt, but I can tell you that I dealt with the same issues that you can see in some of the other pictures in the LED section. The browning/dying/shriveled leaves you see are from CaMag issues that turned into lockout and other bigger issues. BELIEVE ME, took a year to figure out! For those of you that are full organic or TLO, like me, be careful with how hot your medium is. As soon as I stopped doing the Rev's spikes and layers things instantly improved! I use his soil mix and top dress now instead of spikes and things are all good now. I like his ideas/style but you have no control after transplant.
Hope this helps