Interesting, thank you, but my temp is around 22.5–23.8 degrees C, so it must be the light. My humidity is 39%.
I'm a noobie, but the far edges curling up means your lights are too close.
i have read this numerous times, but still quite an amateur myself.
https://www.rollitup.org/marijuana-plant-problems/216537-self-diagnose-your-plants.html <==== click this link
.......Funny .........I would probably have gone for a 101cm instead, but your call