Yellowing leaves in my tallest cola. Living soil grow with Earthboxes with Buildasoil products

Here are the details of my grow- which is my first

-2 Earthboxes each with 2 Grand daddy purple Autos- 4 plants in total
-3 by 3 tent with an HLG 350R
-Products used: Buildasoil 3.0 soil, rootwise + enzymes, opti Veg, horticultural aloe + silica+ Jay Plantspeaker's Quillaja Saponaria extract (these 3 were used as foliar spray in Veg), Grow Kashi. When they started flowering I switched to Rootwise Biophos+ enzymes, and top dressed with Buildasoil craft blend and grow Kashi, and began using coconut water. I also top dressed with Buildaflower

The plants are 8 weeks old- They are supposed to take 10-14 weeks so I have 2-6 more weeks of flowering. It's probably going to be more like 4-6 weeks.

As you can see my top cola (which is 12 inches from the light) is starting to yellow and there is one leaf with a little browning. In a few days I am getting a new tent that is taller so I can bring my light up.

Do folks think the yellowing is a nutrient issue or is it too close to the light? Given how green the rest of my plants are I don't think there is a nutrient deficiency but I don't know

Any thoughts would be appreciated!

Answered your own question.

Marq1340 said:

Answered your own question.

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you mean it's too close to the light?

Too close to the light, without a shred of a doubt. It's 15" reced hanging height for flower, based on regs, not autos. Autos get much more light in total due to longer hours lights on so they would need even higher hanging height than normal. Back off the light, to more than 15"

Rocket Soul said:

Too close to the light, without a shred of a doubt. It's 15" reced hanging height for flower, based on regs, not autos. Autos get much more light in total due to longer hours lights on so they would need even higher hanging height than normal. Back off the light, to more than 15"

Click to expand...

This Is what’s been occurring to me recently. Photos get 12hrs my autos get 20. That’s 80% more light. Now I’m dialling back the wattage for mid late flowering

Rocket Soul said:

Too close to the light, without a shred of a doubt. It's 15" reced hanging height for flower, based on regs, not autos. Autos get much more light in total due to longer hours lights on so they would need even higher hanging height than normal. Back off the light, to more than 15"

Click to expand...

Thanks for that. Yes, my much taller Gorilla tent that should be arriving in the next few days should help.

Nutty sKunK said:

This Is what’s been occurring to me recently. Photos get 12hrs my autos get 20. That’s 80% more light. Now I’m dialling back the wattage for mid late flowering

Click to expand...

I just turned my light down! Thanks for sharing your experience!