Help please!

I have and had brugmansia with this problem. All the leaves are curling under? Some have wilty brow spots and cracks in leaves. I am growing them inside with a growlight, right now young plants 4 feet away 1000w, 21 celceus, good soil and drainage. Proper fertilzing. I have a lot of other plants and may have high humidity? I don't feel it and is very dryoutside. I read about edema? No idea what is going on please help.

Nathaniel