Need help plants look burnt.

[JasonP2024]

Sorry if this is a little long. I started a few GSC & SSH 5 weeks ago. I made the initial mistake of starting them off in a solo cup cut to about 2 inches tall and I definitely over watered them. When I realized my mistake I transplanted them into a full size solo cup and would let them dry out completely before re watering. After that I germinated a few more to see if I had better results using a full size solo cup and making sure not to over water only watering every 5 days or so once dry. The first set of pics are the first ones that I are 5 weeks old now. I transplanted them into the full size solo 3 weeks ago hoping they would recover. The second set of pictures are the newer ones. They are 3 weeks old. I made sure not to over water only watering when dry every 5 days or so and misting with a small spray bottle morning and night. I'm using Bio 365 Bio start soil. Water is PH at 6.3 run off is 6.8. Temp is 77 60% humidity 700 co2 level im using an AC infinity 750 watt led light I had it at 40% and it was 18 inches above plants and thought maybe that was too much so this morning I raised it to 30 inches and lowered it to 20% since i didnt know what else could be causing the problem. I have plenty of drainage holes on sides and bottom of the cups. I know the initial mistake was over watering but figured they would have bounced back by now and the new ones would be good but they are starting to show brown spots on the tips and slowed growing and the older ones keep looking worse. I can't figure out what it is. Was the light to bright and too close. Sorry if this post is a little scattered. Any input would be greatly appreciated.

 

[Galgrows]

Well now you know better not to have a powerful light so close to little seedlings. Keep that distance you got now and when you decide to plant more seeds that's about right on lamp power. They need warmth, humidity and alittle bit of water in a small circle at the base. Those won't recover well it's a hard lesson. I just use a curly CFL bulb i don't even remember the watts but i use a clamp reflector over the plants. Just try again. I save store bought cake containers for humidity cages. Those are clones i've made but i use them for my seedlings also. 2nd pic is a cheapo ferry morris seedling lamp cost about $20 got a little t-5 light in it.

 

[ArtfulCodger]

My guess is way too much light. For comparison, I run seedlings under 25 watts of T5 for the first month. That's the equivalent of approximately 16W of LED.