Bleach,light stress

Yeah, that is some initial light damage. If vpd is off, it'll happen with 'less' light by comparison. raise the light a bit... if vpd is high, dial it in. Temp, rh and light all jive together... 'max' DLI is relative to local context. I've seen this a alot in the past. When i started running at a higher RH% to get a better VPD, I stopped running into it while running lights at same power and hours of operation and maybe an inch or 2 closer, too, so i'm giving more intense light than before. Find a VPD table. follow the recommendations as best you can. Extreme VPD definitely needs to be avoided, but as long as in the neighborhood of a safe VPD, they'll grow well.