how many leds would i need

ok im going to set up a shallow reef 48x20x13 and i was wondering if i should go with either a 4 bulb or 8 bulb fixture and how many blue leds would i need to add to make the corals pop and could i add some reds,greens,uvs and others into it im going to use a tube heatsink thats 48inchs long so any help would be great im plan to do a mixed reef sps,lps,zoas
 
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