The dry leaves are probably not from arid conditions. I live in a place that is really arid--the RH is 17% right now--and I never have leaves get dry from the low humidity. Let's explore some other reason for the dry leaves. What do you feed your plants? Do you check and adjust your pH?
PH of soil was originally 5.9 , PH of water around 8 , I had ordered PH - to mix in the water but they couldn't deliver for 3 weeks so I cancelled the order to get it someplace else and simply forgot about it. So stressful at work these days coz of sick people I do my job plus 2 co-workers job aswell.
I feed them something called Substral (NKP 6-1,3-5) during vegging and they are fine while vegging.
And I feed them Vitalink bloom during flowering (NKP 2-2-4) I did probably do something stupid before flowering. I transplanted them to new soil that I had mixed some 0-20-0 pellets into, and I also broke off some roots while transplanting.
I'm pretty sure I watered them way too little earlier on and have increased the water a bit the last week and a half, leaves has gotten abit better since then. I underwatered coz I read so much about to much water leading to rootrot.
But I think it is the heat, usually over 30 C in the flower closet (thats 86 F +, when its at its warmest its about 95 F) The darn HPS is hotter than the sun.
I have so much planned for the veg and flower rooms, just don't have the energy nowadays since I work so much and hard now.
The 2 closets I use now are only temporary, I'm gonna build custom flowerboxes in the attic, when I get around to it.