First i'd drop your ph to 5.6-5.8. Then I would ask you how far away your lights are from your plants. Third I might want to know if you foliar fed with the lights on and let them dry that way.

That would be what I would ask but I'm not getting involved...
Weedhound Reviewed by Weedhound on . Help?????????????????????? Hi People,Got this problem with my girls, the tops and middle top of the plant, the leaves are going bright yellow from the outside in and then later stages going totally yellow then dead browing(See pics for better idea!).The lower and outer leaves aren't affected as much just a little tip burn with slight yellowing on some leaves. basically it looks like the area most affected is right under the lights! Did i burn them under the lights or is this just a heat stress related issue? Ive Rating: 5