Fruit Automatic Upward rolling leaves

This is a Dinafem Fruit Automatic 66 days from seed. I think still about 2 weeks from harvest. Grown under 600 watt Hps in FFOF.

The curling up started about a week ago. I just fed her 50% recommended dose FFTB FFGB FFBB and Cha Ching. I also lowered the light to about 18" from her top.

I am am figuring this is either nutrient burn or light burn. Do any of you know what this is? And how bad do you think this is going to affect harvest?

Thanks for any help.

Looks like heat stress from the light. Hows your air flow between canopy and light, improve this or move your light back.

You got a lot of things going on.
what's your growing mediums pH?

IMO- Phosphorus Deficiency, Magnesium Deficiency, The really green foliage could be Potassium deficiency or Nitrogen toxicity.

6.3 is the ph. I just fed yesterday so that should fix any of the deficiencies you mentioned. When I put my hand above the cola to see if I feel heat I don't feel anything. The leaves that are rolling up are on the main cola and one other lower branch that's a good 2' from the light and shouldn't get any heat from the light.

It it is later in the flowering cycle so I figured the yellowing is natural and wasn't too concerned about it