its aqualight. but i love it my temp didnt go up a bit but it probly will its only been on a few days. also i hear it comes with a bad bulb. when it came the bulb was broke so they shipped me a free curent bulb! they say the aqualight bulb is piss yellow i have never seen it but my curent bulb is almost as blue as actinics!! i definetly recomend this i think they still have it on sale at dfsm for 250