Do u use the blue and white light?You could get by with 2-3. I have 2 of the 160s over my 6' tank and the light is amazing. I Don't notice any dark areas. I haven't decided if I will get 2 more. I'm going to get 1 360s for my 40b. I'm going to set that tank up with anemones and SPS maybe some LPS. I also have their controller so I can do a dawn to dusk program. I liked the fact that I could buy the min number and add on as I could afford it. Originally I was going to use both the Kessils and my Chinese boxes but the light from the Kessils was much nicer so I took off the other lights.
The blue part of the spectrum is the only region used by corals for photosynthesis. White light contains the frequencies that support algae - nuff said about that!Do u use the blue and white light?