Re: Subject: [CH] yellowing under artificial light Karen, they're not getting enough light. You didn't tell us how many florescent bulbs you're using, nor what size. To cut through a question & answer session, I'll tell you what I do. I use four 48" bulbs, in two "shop-light" reflectors, as close together as I can get them.Then adjust their height so that the foliage is always 8-12" below the bulbs. This means you gotta have a way to continually adjust the distance between the bulbs and the foliage. Tom