When should I give my seedlings the T5HO fixture full power? Right now I just have half the lights on at about 8” from canopy . Should I wait a full 7 days from the day they sprouted?
I would wait at least another 7 days. I normally start with only a single 28w T5 for the first two weeks and then up the power. Always air on the side of caution especially with such a young plant👍