Those spots are calcium def.
I'd say ur plant has got a couple weeks yet.
This is my first grow with LED lights, I've done tons of reading on them and it seems a lot of strains will have cal def using them. I got my bottle half way thru my grow, you can see in the bud shots the brown spots on my LSD leaves. Check out my last post in my First auto grow LSD-25 in my signature, some pretty nuggs.