My first time using LED
Im using a buddy’s 1200w LED fixture.
Took me a while to realize sprouts need a few feet of distance, lol.
Anyway, Im using subpar recycled soil and have been using Medusa and Amino by Nectar for the Gods, for now as thats the only thing thats around.
I was getting fast growth and happy plants, but now Im getting yellowing Ive never experienced before.
My guesses are either too much P, or an Fe or Zn deficiency
Thank you for any input.
Add some calmag to your feed as under leds for some reason plants require more calcium and magnesium.
If your calcium is locked out a plant won’t be able to uptake other elements.
I’d also be adjusting the PH of the feed as your using recycled soil the dolomite lime will likely be depleted. 
Hope I’m mistaken, but looks like you have pm on several of those seedlings.
That reaalllly looks like pm
@GCBudz Looks like pm to me too.
If it was me I would chop everything, clean the room and start with fresh soil.
That seems a bit overkill to be starting seeds with. I would recommend a smaller light to start or turning that one way down to like 10-20% output and hanging it a good 2-3 feet above canopy minimum, then adjust accordingly as the plants start growing.
Definitely PM, but its not contributing to the yellowing.
Two separate issues
Would if i could, this is a shoestring run so its the only light i have access too.
I will try some dolomite and treat it like an Mg deficiency
LEDs lack radiant heat so uptake low for intensity of light used ( imbalance )
Not the lights fault, apart from the PM which points out there are other issues present consider that it looks like Medusa is a high P fertilizer if consistent and depending on soil conditions you could also be driving the PH low along side excess P, something a bit more suited would be say a 2/1/3 ratio of npk or something a bit more balanced than peaked in P.
Considering the PM even if shoestring look into way at increasing some air exchange just cause your likely high humidity.
I have avoided led for the same reason , I plugged some in to try on veg and the plants went cal mag deficient almost immediately. A couple strains were even trying to go into flower under 18 hours which is a sighn that they think they are dying. I adjusted light height , upped the nutrients , dumped enough cal mag on them to be sure that wasent the issue , my room temp is fine so I concluded it had to be the lights.
I switched back to my normal t5s and normal new growth started the very next day.
They are missing the uv spectrum and the green wave length and it seems some plants react more poorly then others to the difference in light. They are typically full spectrum and vegging plants do not like or need that much red light. They need to stop making them full spectrum and focus on grow and bloom specific light spectrums. They need to be dropping the price sense it’s made mostly of cheap chinesium.
If I want to cut down my electric bill I think I will install solar before I convert to led lights.
It’s to the point that when I show people in the industry some dank smelling tasting weed they respond you must still use hid or be a outdoor guy…
I could build a climate controlled automated light dep green house for what some of these bigger grows are spending to convert to led.
The only benefits I see are they save space and cost on bulb replacement but it’s not worth all the other hiccups that come with them.
Dag nabbit I won’t have anything to do with that horseless buggy contraption. Next thing you know people are gonna try and talk me into indoor plumbing instead of that 100 foot walk to the outhouse in subzero weather. Don’t get me started about that telegraph thing. They say it causes cancer. 
Those were improvements leds are a bandwagon trend at this point.
Up the tech and lower the price maybe I would consider but as of now the proof is in the results and the results suck.
Saving a few dollars is not worth having sub par flowers , I grow my own to have the best quality possible and have seen and smoked enough led weed to know to stead clear of that nonsense.
If it was just the soil, every plant would exhibit this.
Instead, as Heritagefarms pointed out with his experience, its only with some plants. Other plants are absolutely healthy.
LED just doesnt incur the plant metabolism I desire ir am used to.
But hey, nice Ad Hominem
There are huge long time growers converting back as we speak, the conversations are being had low key that everybody remembers certain strains(most) being a lot better before led, nobody wants to risk sounding out of touch tech wise in the industry so they just follow along blindly.
I’ve tested both types of light and have been growing indoors for over twenty years , let’s talk about putting tape over street light photo sensors if you want to talk horse and buggy.
It looks like the usual mag deficiency with LEDs, I would hit them with some Epsom and maybe a roasted eggshell topdress. The yellowing from the petioles outward could be sulfur, from the guides I usually consult for this stuff:
https://www.cannabisbusinesstimes.com/article/upper-leaf-chlorosis/
So you’d recommend HPS? What about CMH? My only issue with those lights are the extra heat…
I haven’t noticed any issues with any of my leds per se. I feed calcium at NPK levels. Everything I have is under LED’s.
This is telling tho:
If I wanted to be with the times I would say convert to led , don’t flush and cure with boveda bags but I like my weed to taste good so I’m going to keep doing what I do and watching others trip over there own mistakes.
If you have enough ventilation going threw your room with vented hoods there should be no heat build up issues and you should have that much air exchange anyways to prevent other issues.
I’m by no means saying what others should be doing , if what you have going works for you run with it, every bodies environment and methods are different and some seem to feel fine about led, I’m just voicing my experience and thoughts on the matter before I’ve had my morning coffee 
