Def. not dead. Looks more like serious stress b/c they are just growing single blade leaves right? Have the lights been switched back and forth? or does it stay dark when it supposed to be dark. Also the shraded leave edges, how the side of the leaves come to points also means something, but i forgot. Those are in 1gl bucket? With those lights should'nt water more than a gl. every 2-3 days. But go buy feel of plant weight.