Looks like your light got too close or you got drops of liquid on there that magnified the effect of the lights causing spots to burn. Are the spots only on the very top leaves? If there's nothing wrong with the lower leaves it is more likely light burn and not a nute problem.
inkman called it, if you guys notice the other post in the forum, the tips are turning up and changing color. i'll administer Ph nutes swiftly, but not overdo it. the color changing is just on the lower leaves, btw.