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
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Mark...
290g Peninsula Display, 425g total volume. Setup Jan 2013.
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