brown crispy spots on edge of leaves, in LED tent only. pics inside.

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okay so I have a few plants under a blackstar 500w LED panel that have developed brown crispy spots along the edges of the leaves mostly, with some intervenaial chlorosis popping up aswell. it seems to be more on the top half of the plants rather than starting from the bottom moving up. these plants are ~3wks into flowering and are in 3gal smartpots in a coco/perlite mix.... feeding H&G coco AB with hygrozyme, HG Bud XL, AN bigbud and drip clean (CalMag every few times)

theres 4 plants in the tent, blueberry gum, critical +, fruity chronic juice, NLxBB. the blkueberry and the critical have this problem, not horrible and dying but a decent percentage of the leaves look like this, the NLxBB has only a few leaves with these symptoms and the fruity chronic juice is fine as far as i can see...

might this be caused by the LED somehow? I have 2 other tents with the same strains in the same medium which I feed the same things on the same schedule, they do not have this problem and they are under HPS lighting, is this LED related? i have the light roughly 12-16inches from the tops, I tried out a Kessil light a while ago that turned a plant bright lime green from being too close. I dont want to rule out nute problems tho, it just doesnt appear like any kind of burn/def issue ive seen before.

i just flushed the 2 worst ones with FloraKleen and then fed lightly with Biothrive Grow and Florablend (my veg feed)

i would say cut down your feeding buy 1/4 but sence you have a nother room doing the same thing thats crazzy.

im really would like to see the differences if your doing a led/hps grow i think led are coming a long way and thinking of trying it myself
if your doing a side by side grow that would be cool to see.

are you doing a grow jernal if so send me a link thanks bro

Nutes, sounds to me you done the Rt thing,id also second the feed cut.

word, thanks for the input... tonight i feed with a ~675ppm doseage of all the normals, xcept i left out bud XL, that stuff seems to just suck the green out of leaves at times and didnt want any misleading symptoms popping up. I think for the next week or two I fill only feed with nutes once a week and just water with a lil humic acid the rest of the time, i never go above 900ppm in coco but i have heard from a few people they run considerably weaker nutes under LEDs than sodium lighting.