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[Arthur]

What's your rH? At this stage it should be 60-70%. Low humidity will cause leaves to curl on young ones, their leaves give off more moisture than the roots can keep up with yet.

Also, under HPS, your too warm. 80* to 85* are LED temps. The IR in HPS drives your leaf temp much higher than LED.
Hps temps 72 to 78 as a high.
The one issue is very likely exasperating the other.

 

[Wico]

Just checked and mine does it too and she has everything she needs. Under LED.

 

[Arthur]

Just checked and mine does it too and she has everything she needs. Under LED.

Then if temps and rH are dialed, then I would assume a genetic issue.

 

[Kystro]

My humidity is about 45%, plant still growing healthy though... Will it be okay?

 

[automan2]

I don't often see leaves on plants showing this issue, but when I do, it's usually a primary parameter that is off...maybe two...Get heat controlled as hps is problematic when temps get above 80-85....one day of heat can and will cause long term stress to a plant.

 

[Arthur]

It will grow, and it will be ok rH wise. You'll loose some size off the plant probably. Your temps will cause the flowers to be airy, and high temps will cause issues with nutrient uptake as shes using more water. I'd try and get the temps down, you may get rewarded and see a small spike in rH.

 

[Proph]

It's a sign of stress.. Usually heat or humidity. Every plant is different.. So just because the environment is dialed in, doesn't mean that the plant will not be sensitive to something in that environment. You want to find the sweet spot for temps and humidity based on the plant. Make small environment changes once a day until it stops occurring.

 

[Mañ'O'Green]

High Temperature, low RH, poor air circulation and strong light strength can all play a role in "tacoing" leaves curling along the edges to the midline. You are not exhibiting much and I would not be very concerned at this point. Try adjusting just one environmental factor at a time until you see improvement. I would start with getting the humidity up to ~60%.

 

[Kystro]

High Temperature, low RH, poor air circulation and strong light strength can all play a role in "tacoing" leaves curling along the edges to the midline. You are not exhibiting much and I would not be very concerned at this point. Try adjusting just one environmental factor at a time until you see improvement. I would start with getting the humidity up to ~60%.

How can I get the humidity up mate

 

[Mañ'O'Green]

How can I get the humidity up mate

Hang a wet towel with one end in a bucket of water with the fan blowing past it. This is generally a stop-gap measure. I use one of these and it works very well.