Was it you mega who had the problem of leaves going purple?
Checked back in the thread and yes it was.
I've had no end of dramas since I've used lighting.
Previously with no artifical light, everything looked good.
Now I've got leaves going purple, dark dark purple especially on the czech black and jalapenos. (edit: refering to the Cotyledon leaves going purple/black here on the top, the under side of the cotyledon leaves are green)
I've been watering a fair bit because the light and the heat from the light dries my seedlings out. They really are bone dry nearly every day.
Also now what hasn't got purple cotyledons and has some true leaves are now yellowing from either over watering (doubt it because the soil is pretty dry, will crumble to nothing and the roots of the seedlings aren't deep).
Maybe some other problem, like the light made them start growing but everything went to crap for some other reason than too hot/too dry/too wet? Definitely not too cold, as they have a lot of heat from the lighting. I have made the lights sit higher up to reduce heat, but not a lot of response from the seedlings over the past week, more went black/purple seedling leaves, more yellowed. There's one with a white withered edge to it's leaves like it's sunburnt. I just ripped one other out as all it's leaves were dropping or drooping about to drop so it looked a goner, but it was fine before put under any artificial light, and it's roots looked OK.
Seedlings aren't doing well at all, just as well they were old ones I didn't care about. As such they were just in 60mm small round pots and regular potting mix. I think I had given them a bit of seasol and that's all.
Growing under lights is hard, really easy to dry them out, really easy to over water them, burn them etc. If these don't recover (going to sacrifice a few to let them wilt to the point they need water which by then a few will be dead), I'm just going to wait until warm weather outside before I grow my new chillies from new seed.