Actually before I setup up this tank I already had 3 so I put them on, realized I was gonna need a couple more 160's or got to a 700 or 3 360's. I tried two more 160's and it works great. I really have no complaints, you just always wonder what if? At first it did allow me to control the amount of light in a section, but as soon as I added a couple montis and acros and they took off I ramped them all up and well you can see the results, not bad in my book, I'm happy with the results the lights produce.