I have had this light now for two months and in the two months I have had to return the original order because the light was bad upon arrival. The replacement worked fine for less than 4 days before one of the external ballast that power the light went bad. I had to return it for replacement and pay out of pocket to return it. Now a second ballast went bad in less than two months and now I am being told I have to pay an additional $62.00 to pay for a new one. Again great price but not worth the hassle, what started off as a $335.90 light has cost me and additional $77.00 in delivery fee's and replacement parts in less than two months... I simply can't encourage anyone to buy this product. Sorry...

48" running on a standard 75 gallon tank.
Initially I wasn't sure whether I liked the 'shimmer' that the lights produce in the tank but I've since grown accustomed to it.
To date there have been no problems with the light. I removed the optics shortly after installing the light to give a broader beam for each LED. I found the beam with optics too narrow and it impacted on the overall spread of light in the tank.
Algae growth is abundant, I would say slightly more than my previous setup which was 2 T5 (Actinic and 6500K) and 2 T5HO (Actinic and 6500K). My 2 bristlenose plecos are barely keeping up with the glass algae, the rocks stay clean however.
Had I known how hot this fixture would get, I would have ordered the fan system which is an optional add-on. That being said, it isn't much hotter than a regular T5HO fixture.
As with the Beamswork and Marineland LED fixtures, the switch options are limited to lunar (moonlights), off and lunar+white. As with the majority of folks with these lights, I wish there were separate switches and plugs for the white LEDs and the lunars so separate timers could be used.
Overall, I'm quite happy with my purchase and intend to equip any future tanks with the same light.
-Addition
I've recently taped over some of the blue LED's as it washed out the colors of some of the fish. I prefer the whiter look the light now gives the tank.