Ian, figured I would continue answering your questions here instead of by PM. I think for your sized tank you will need at minimum 48 LEDs with 80 degree optics to provide sufficient PAR for SPS corals. Personally I would go with 54 to 60 LEDs. For comparison, I used 80 LEDs with 60 degree optics on my 48" x 18" tank in 4 rows of 20. I am currently running the blue LEDs at 100% and and the white LEDs at about 80% and have around 500 to 600 PAR 1/3 to 1/2 the way down my tank which is 20" deep.
With your tank being 12" wide rather than 18" you could drop one row and do 3 rows of 16 to 20 LEDs. The more you do the higher the PAR will be. With 24 to 36 LEDs you will have to run them without optics and may not have sufficient PAR for many SPS.
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