T5s throw a lot of lumens out I never have it closer than a foot. two feet to three feet is not out of the question for seedlings If you are cloning or starting seedling you want to maximize your light having them that close stunts them and keeps the nodes to close imo. In flowering stage it is a whole different story but honestly they are only a veg light hps mixed with t5s is the way to go in flowering imo. I run two 8 bank t5s for years four footers.
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