Yeah, I think I have been fighting a bit with light distance on my first grow with my diy LED setup. They are a bit hotter than I anticipated, at least they are if I have been reading the symptoms correctly.
I don't see any signs of heat/light stress in your pics though. You do not have any sign of tacoing or leaf tips pointing toward the light - the leaf edges are turning away from the lights which is the opposite of the typical reaction to excess heat or light.
I am still a bit suspicious of a watering issue given that some of the leaves may be drooping a bit. As you note however, the drooping tips could be the beginning of nitrogen toxicity, but until the tips burn a bit, the jury will be out for noobs like me. Another possibility, but another I am new at, is early calcium/magnesium deficiency before color changes develop. At this point, there is nothing in the color pattern consistent with such deficiency, but as I understand it, leaf distortion can be part of that picture.
In any case, I doubt that you have done any serious damage so far. If they do not perk up with growth you are happy with soon, I recommend that you start a thread in the infirmary section and someone with more experience will help you. Please fill out the form to give reviewers all the information they can use.
