Can anyone tell me what is going on with my Padrón pepper plants. The seedlings are about 3 weeks old and haven't grown much compared to their tomato neighbors. About half of the seedlings are showing this brownish purple color on the leaves and the other half look great. They are currently in a south facing window under LED grown bulbs. They are about a foot from the grow bulbs so I don't think they're being burned but I'm new at this. Any ideas would be great. Thank you,
Bill

Peppers are not as fast growing as tomatoes.
I grow under fluorescent which can even touch the leaves without burning. I really don't think they're burning.
It's hard to be sure what the pic shows with the bulbs giving it an unusual color overall. But it is odd that some have the color and others don't.

Tomatoes I planted a month after peppers have already passed them in size after a couple of weeks, so I don't think you have anything to worry about there.
I agree with Sallyg about the lights throwing colors off, but I can see the patterning in the leaves. Are they on a heating element, sometimes I have had pepper plants show leaf color when they got chilled (but not frozen).