Anyone using Jacks 321 under LED lights?
what are your feed strength in flower?
I'm under 240 watts QB leds 2 weeks into flower feeding 850 ppm and getting twisting mutation looking leaves and uneven green very small bud sites.
When I used 321 (15gr,10gr,5gr in 5gal) with LEDs, I had some deficiency in flower. I opted for 14.5gr, 12.5gr (calnit-yara), 4gr epson, 1.25gr of greenleaf bud explosion (equal to 2x DIY Hammerhead) and a pinch of micro nutes. I sit around 850ppm 1.7ec.
some great info from a icmag user at:
http://opensalts.wikidot.com/an-hammerhead-0-9-18
Not sure what strain you are growing but i stick to sativas.
As soon as i increased calnit, the grow was solid. I do grow in coco and i run 75f (24c) at lights off, 84f(28c) lights on.
your HPS looked dialed in. Try running your LEDs a bit warmer.
Hoping for the best for you.
If you like hps, look for UPDAYDAY HPS4000 led on amazon. If you wait, deals for 50% come around frequently.
If you have already bought leds, nevermind.
This will be my next light. Deals come up on riu in the best deals forum.
I had to mount the drivers in a separate room those things get hot as hell so many lies about led.
f-e
I did with a excel spreadsheet that breaks items down. You actually helped in a round about way when i read your posts about LEDs feeds and Calmag.
I have noticed healthy growth at the moment with a pinch of micro nutes.
The Jacks 321 is pretty good. I have been supplementing with minor doses of fulvic acid that is boosting uptake compared to prior grows without.