Heat stress or too much light?

[Serpent]

May have something to do with reflector as it is a cool tube but it does have kind of a cheesy wing on it and it was only doing it to that one plant in that one spot as for other plans are the same height give or take.

I appreciate everyone's help here love the form grate reading and great information

If you have some free time check out my other posting I have a clone that looks kind of weird compared to the other ones don't know what to make of it