I love the amount of light this fixture puts out too. Samurhai...sorry for not responding to your question, must have missed it. My other lights are:
Rear light bar has 2 54w Marine Glo, Atinic bulbs
Front light bar has 2 18,000k 54w Power Glo Bulbs

I have the atinics kick on at about 6am and they run till 8:30pm. The front bar is on from noon to 8pm. This way I get to look at everything all day, but it's not so much light that I have algae problems.