Mars hydro fc 4800 height to seedlings

Nice light! It’s hard to say but those have nice distribution and don’t have hot spots in the middle like the quantum board style ones do. Id personally run at 50% at 24”/60cm and observe the next few days. You could probably get it up to 75% once you have a few nodes. Look for stretching, as that means they aren’t getting sufficient light Like I touched on earlier, those have great distribution of light so you should be fine whatever you do chose to do.