A quick look at your plant reveals blisters on the leaves. Right for ground. Blotches on the left for ground leaf tell me your light is to close.
Your light needs to be a minimum of 24 inches above the plant. 30 inches would likely be better.
A plant this size will be happy with about 300 ppm Nitrogen. .6 would be ballpark.
The chart is a picture you can right click and save.