Leds are bleaching the leaves for sure. Leds are very hot with out much heat brother.
hps you can do the palm of the hand trick! Too hot for your hand too hot for the plant!
but LEDS different technology, can not feel the intensity.
Back off the light, check, vital signs, ph, amount of food etc.
check new growth as it comes see how it looks.
if the light is your only issue they will rebound, some better then others maybe.
the ones that grow back fine and produce! Clone those!
You should be feeding 3-4 times or more daily in coco. Leave your nutes alone and up the feedings.
Put your light at 20 inches and set the dimmer at 50%