At first i didn't think it was as bright as my two bulb Hagen Glo, but after only two weeks i noticed an explosion of corraline growth on my rock and my PH case. i just started checking and dosing my Ca, Mg and dKH, so i will know better in a couple of weeks as to how things are doing. I think the only way i will be able to tell is by the colour of my corals and their growth if i keep my chemistry in check. What do you run for lights? 
		
	
		
		
		
		
			
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				Fluval Osaka 41g sumpless tank, 250w MH + 130W PC , DIY HOB refugium, Tunze 9002, Koralia 2, Koralia Nano 
 
Toad Stool 
Colt Coral 
Purple Shrooms 
Red Shrooms 
Candy Cane Coral 
Hammer Coral 
Moon Coral 
Copper Banded Shrimp..and growing
			 
		
		
		
		
	
		
		
	
	
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