Chapel of Love

She looks like she might be overwatered... generally, I like to "feed" them water via high humidity by soaking a towel and putting it in a ring around the seedling. This gives them the humidity they need (this is how seedlings actually get their water until their root system develops sufficiently) plus it allows decent air flow and access to light. If this were my baby, I'd surround her with humidity and wait several days before giving her another drink. Good luck with all your grows!

I'm not seeing a lot of damage on your plants, but they may not like that. Do it for lesser time and at earlier/later windows when the suns not as strong if you want to transition them to outdoor growing. If not they may loose a lot of older leaves and put on new ones that can take the suns intensity. Giving that your only growing using leds. They need to be very powerful to mimic the sun and most aren't. Putting a plant from a indoor tent to outside is a hard transition. Full sunlight on a hot summers day can burn them up. PPFD of the sun in high noon is aorund 1700-1800 with a full spectrum across the board. No idea what your LED's are pulling or if the efficiency/spectrum is high, but I doubt its in that range of 1700-1800. Be Careful & Good Luck!