If its for a typical 3ft tank, I think less light will be perfectly adequate. Are the reflectors parabolic? If DIY using parabolic reflectors, then 4x39W costs about $180. FYI, my HC is creeping along the substrate perfectly welldespite only 2x54W T5HO suspended about 45cm over a 120x60 area.





 
			 
					
					



 
				
				
				
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