Can you spot the problem? (pics)

Happened 16 hours after watering. However the other plant seemed better. Thank you

What kind of light, and what height?

Birmingham haze said:

Happened 16 hours after watering. However the other plant seemed better. Thank you
View attachment 4279988 View attachment 4279990 View attachment 4279992

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mmjmon said:

What kind of light, and what height?

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Same questions from me.

120w qb board at 18inches. Temps are 74

Birmingham haze said:

120w qb board at 18inches. Temps are 74

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Raise the light. It's not the heat. It's light intensity. Suggest 22" at least. I would go higher until the issue is resolved.

hotrodharley said:

Raise the light. It's not the heat. It's light intensity. Suggest 22" at least. I would go higher until the issue is resolved.

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Thank you sir. I will try this

My neighbor switched to LED. Electricity is expensive here in Alaska. Really expensive. He started having issues and there was no information like that site or this one.

https://www.ilovegrowingmarijuana.com/nutrients-deficiency-calcium/

There's still guys on here who see my comments on effect from LED and ask if I'm still on this. Now there's more evidence of problems that can be addressed and fix most of the issues. Increasing light distance is a quick attempt to stop it while you figure it out.