I am the guy that put 3 of the 16inch reef breeders over my 180 mixed reef, and they rock. I went with the 90 degree optics and I am glad that I did. I have no spotlighting, and I am getting great par at the sand bed. I had a 72 inch. 14 bulb HOt5 fixture on my tank befor I upgraded to the LEDs and it did a great job, the only reason I switched was because I wanted to be able to have more control of my lighting colors, and also have less heat. I still have the 72 inch fixture if your interested in it.