I'm not certain it matters so much. That said, I was told by a master gardener (in relation to *all* seeds regardless of type) to not put the seedlings under light until the cotyledons break the soil. THEN they should all go under light as close as possible without burning. For cool flouros they need to go pretty close and you'll need to adjust daily or so as they grow.
This tends to work well. If using a humidity dome to sprout, remove when the cotyledons appear above the soil