I disagree with everyone else.

In your pictures there are no signs of nute burn. This is not nute burn. Nute burn affects all of the major leaves, not just the leaves in direct exposure to the light. Move your lights up and increase your circulation! You have light burn, period. This can be compounded by under-watering. Check your soil and water only when the pot is light in weight. If the soil sticks to your finger, it's wet. If not, water until 20% of the total water drains out of the bottom of the pot and check every 2-3 days.