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			 Hi, 
		
	
		
		
		
		
		
	
		
		
	
	
	Usually corals are in the 0m to 40m water depths. From a PAR respective -- 40m is about 125-150 uE/(m^2 * s) or around 3000 lux. Around 7000 lux at 15m. - Victor.  | 
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