Anything over 4000K is enough to get the life juices churning. Seedling's light demands aren't that high and the warmth is nearly as helpful in the early stages. An old style T12 shop light will put out nice 10-12" stocky plants, and maybe 13"-15" with T5's. At that point, plant demands are soaring and fluorescent's lack of penetration become apparent with spindly growth and less foliage. Which is perfectly fine, because it's time to go outside with them anyway. Just my experience.
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