No I'm running them 24 hours so environment is pretty consistent and the other one in the tent (freebie from meph) looks normal so not sure that's what it is.I have been seeing a bit of that this year. It was on a couple different strains so I it must be environment related. Do you get big temp swings between lights on and off? I don't heat my space and get a 15 degree shift over 24 hours.