I do not know what temps it burns at right now. The compact CFL i ordered is 2700k, but I don't expect that to overpower my fluorescent tube. I also have a 400watt(?) MH light that I might use. It currently isn't inside my grow box because it gets pretty hot and I need better ventilation for that to be inside.

I did plan on keeping the light cycle in 24/7, but now I am considering the 18/6 once they reach they're 4th set of leaves. Why would I need them set to 18/6? To promote root growth?

Also, they are just started to grow their 2nd set of leaves and I planted them about 10 days ago.