Light Burn?

I’ve been having great luck so far with my first RDWC grow and besides a cal mag issue at first from me filtering water everything has been pretty smooth until I turned light up a few days ago and then a water change 2 days after I turned light from 50-60% I first noticed the leaves looked different yesterday morning like the first pic and by the evening after work it was a lot worse and was told the light was most likely the cause sense I put same everything in the water as last time and been fine want to flip them ASAP but now this came up and need to make sure they aren’t stressed I have a mars hydro fc 8000 in a 5x5 at 50% 78*f and 55% rh also leaf temp was no higher than 75 this morning after turned down

You ever figure out what caused this? Did you get it turned around? I have some similar looking leaves rn. Thanks

If it's only affecting your upper most leafs, then yeah,.. prob light burn. Look at your mid growth, it it doing fine? or doing the same?.. if it's doing the same, then you have another issue. To this day, I still light burn my plants.. but, I can tell by looking at the plants in-between the lights.. if they are fine, then im burning the ones directly under the light.