Light bleaching on these little ones?

[Trich_Tyson]

What do you think?
bigger seedlings are a couple weeks sprouted.. headbangers are like 6 above ground.
Started under 6500k t8's.. nice and close. started getting too cold down in the basement so i moved 'em into the room. Under a 600 has @ 50% several feet away.. I don't have anything lower wattage that fits in the tent
that was 5 days ago everything was great.. temps were at 73.. wanted to boost that so I had to crank the light up to 75%. 2 days ago.. only raised temps a few points.

today some of em had this going on.. some phenos of the larger seedlings are so far unaffected.

some babies affected.. some not

 

[Vanilla Phoenix]

I'd probably crank the light back down until another week or two. Even if the light isnt the problem, it will help rule it out real quick.

 

[corky1968]

An option could be to place something between them and the bulb for a few days to shield most of the
light rays. So they get mostly indirect light for the first week and they'll should be adjusted to it by then.

I've had young plants placed outdoors bleach white from going too fast into direct light.

So yeah protect them early on and all will be fine.