Deficiency or too much light?

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Hey guys,
all was going seemingly well but come up with a bit of an issue with one plant... filled out the form as best I could. Real dodgy me getting these plants into natural light so taken in the tent. Hopefully the pictures are good enough. Taken some with flash and some with the cobs (blurples off)

-Problem:
I had some issues previously with the other plant but it was mostly put down to possible climate or even pheno. Now I have issues with the other!
Leaves yellowing on one of my plants. Growth is going pretty well otherwise, she gained 3cm/1 inch the last 24 hours. Affected leaves seem very random, not older lower or younger higher. I’m wondering whether this could be something to do with my lights. Otherwise possible mag def? They have been getting calmag so a bit baffled if that is the case.

-Medium/grow method:
Coco - biodiesel pro mix (with 30% perlite I think)

-Feed and supplements used:
Sensi pro Biodiesel full lineup.
Feeding everyday for about 2 weeks now.
Custom gravity drippers.
Been increasing by .1ec every 5 or so days, watering down recommended dose to the right ec. However, last two feeds I bumped it up from 1.4 to 1.6, actually giving the standard recommended 4 week dosage. Been giving them 3 litres each for about a week, before that 2 litres each a day. In 3 gal pots. Fed at ph 5.8. Targeting 20% runTested run off and it’s inline with what went in.
Still feeding veg, plan on switching once vertical growth has stopped.

-Water source: water bubbles for 24hour +
Base ec.1

-Strain and age
Jack Herer 40 days

-Climate:
Temp: 24-28 (30 max on real hot days)
RH 45%-65%

- Light used:
Cobs: 2 x 100 watt full spectrum, 2 x 50watt dual spectrum, 100 watts of blurples
Lights at about 55cm from plant tops.


-Additional info:
Plant has shown signs for maybe a week or two and has slowly progressed. It seems like it may align with when I turned on the blurples and the two 100watt lights. One leaf almost looks like it’s been sunburnt with a shadow of another leaf above it.

With flash
30A3A11E-9256-4C81-BB43-04C73992C755.jpeg
C87FFBE7-DE78-4F29-9E8C-4D89F7113898.jpeg
40D5D304-6267-4FC0-979C-14A218E14B16.jpeg
823D64A1-7B3E-4B73-A643-19A58184D8D5.jpeg
240A9BE2-7DE9-47E0-9C62-728FD56B0930.jpeg

0DBC080E-F440-4BC4-917C-57A144839C03.jpeg
C9802893-976C-421A-9E40-FA9C9CC84375.jpeg
6CC9A78E-0BBC-46D5-9B26-36FF9DBB9BBA.jpeg


with grow lights
B776C551-3BA0-43AF-9846-4E2D72F1CD92.jpeg
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E5CFA1D4-2069-4EFA-B79E-BCD1CBFCF2A0.jpeg

appreciate any help. Thanks!
 

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You see those yellow tips on those leaves? Thsts the first sign of over feeding/nute burn. The other discoloration on the leaves is a result of over feeding. You should only be increasing your feeds when/if the plant needs it.. Too much of one nutrient will lock out other nutrients making them unavailable for the plant to use.
 
Message heard! I’ll dial it back. I think I was probably at 1.2 when I started seeing problems, now there quite a lot bigger I guess I wouldn’t want to go lower than that, will going down from 1.6 to 1.2 be good enough? Cheers!
 
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