Looks like we got a pH issue with them, which leads to lock outs and toxicity. I would check the water that you are using to make sure that you have that at the right pH. Also how strong of a dose are you feeding them right now? Something tells me with the way those leaves are turning that your dose may be really high. Also LED will suck the cal/mag right out of a plant and if you have a pH lockout going on as well its adding insult to injury. LED drawing the plant to use more cal/mag, and it cant take up any that you may be feeding it.