They are actually t8 lights. Im using a 6 litro bulb set up. Clean spectrum 5000k. Gonna use them the whole way thru. Testing them out on behalf of my hydro shop. So far excellent results. The owner of the shop showed me some pretty nice stuff he has grown with it. I didnt believe it so he hooked me up with these lights jus to prove me wrong. Lolthats nice man let me kno how much you get dried.. its a nice looking plant tooo for your first time also. one more question how are those t5s trating you mive beeen with hps high preassure sodiumn lights?