Plant curling brown spots yellowing

Just a quick one, I think my lights have been a little to low, this is the start of week 2 flower, I've raised the lights but on certain parts of leaves they've got an unusual curling/browning of the leaves. Other than that they look healthy. Attached is a close up of the issue and then an overall look of the plant.

Any help is really appreciated

I'm seeing the beginnings of molybdenum and possibly phosphorus deficiencies, and heat stress. For better help, you'll need to give us more details about how you care for them, what they're planted in, type of lights, nutrients you use, as well as any pH and EC or PPM measurements you may take.