They are currently under 600w LED panel, "full spectrum", and it's about 20 inches from the tops. It WAS about 8-9 inches from the tops, but that was what caused the yellowing. They were getting bleached to heck. I'm SURE they're getting enough light, and I'm also fairly sure I'm micromanaging them, which I really don't need to be doing. I called the farm again about them. and they said if the seeds are from them, they're autos, I just stunted them with where I had them under the lights. I'm not on a timeline or schedule, so I don't really mind if they take longer.