Advice on how many LED's and Optics for 90 gals sps reef tank

[mseepman]

Tough question unless you know what LED's you plan to use. I'm planning to build a fairly large LED light for my future tank and plan to use CREE LED's. I believe that for 24 inches deep you would be okay with 60-80 degree optics as long as you used enough lights. As for how many lights, again that depends upon the type of LEDs