Should I be worried about the discoloration on just one on them. Personally I think it from her having cooler temps at night 64F {18C} or could it be from my lights it a HLG 600 Rspec it does have a dimmer switch I have it set 70% not sure there's no % on it so I am going by all way to the right 100% so 3 clicks to the left would be 70%. Height is about 24" and that's about the highest it will go....what to do ????