Looks to be a touch too much N, and you may have too much calcium or phosphorus, also your ph being a tad bit high, can lockout manganese which what those early spots may be. It's not a calcium deficiency as that would look much worse. Led's do not make your plant eat more of one or two specific elements..that's folklore that is passed around! Led's are more efficient than say hid's, so perhaps your plant grows better/stronger under one, so you need to feed it better. To say that an led makes calcium and magnesium immobile is completely wrong! First of all, calcium is already an immobile nutrient to begin with. The slight nitrogen toxicity is evident..remember, it's a domino effect. Work it backwards. The spots are either a calcium, magnesium or manganese deficiency with slight chance it's boron. So you have to look at what affects those nutes from getting to the plant (assuming it's in the medium already).
Bare with me....we know the nitrogen is too much..which in turn can lockout potassium and boron (slight chance it's the start of a boron def) and copper. With the extra potassium sitting in your medium, that as well can straight lockout boron, as well as magnesium. If magnesium starts building up, it will affect calcium, and ultimately the excess calcium in the medium will lockout manganese and boron. The lockedout copper in your medium (from too much potassium) can also lockout manganese and iron...excess iron would also cause a manganese lockout. Otherwise, if all is right, then i'd say the high ph would be locking out manganese straight up. It's the hardest element to get into the plant ph wise..it needs a lower ph than all the other elements. If you're constantly at 6.5..you have to water below 6 sometimes to swing the ph a bit so other elements like Mn can be uptaken. My guess points to a lack of manganese. Again, if your nutrients contain it, then it's there, just locked out for one of these reasons...best of luck!