i grow useing a hps no problem so in a spare tent set up a 180w mars ufo led, 3 nice bushy plants 2 ft tall, everyone of them in flower crinkled and dies, did not reach 4 weeks in flower, now been groweing a few years and grown under hps,cfl, t8 etc and never had this problem. height adjusted from 10in to 2ft made no difference, leaves dropped, some curled most just died.Will be getting rid of.