In my case i find that color of the coral (SPS) is as much dependent on the water quality and amount of flow as it is depends on the light. I use to have a lot more light in my earlier tank (400W 20K) then i do now but with better water quality (less bio load, amino acids,bacteria addition and Bare Botom)  and more flow i am able to keep SPS with better colors. 
		
	
		
		
		
		
		
	
		
		
	
	
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