Yeah, T12 T8 T5 CFL's, they're all fine, and 4100k is fine. It just doesn't take all that much light to bring seedlings to that 6" to 10" outdoor transplant stage. I think early growth is more controlled by hours of light and temperature than intensity of light. Maximum growth conditions in my mind are, 18hrs of light, ferts started at first true leaves, and ~75F days/ ~65-70F nights
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