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					Originally Posted by  Canis Vulpes
					 
				 
				Below is from the Nikon SB-800 manual, as can be seen reducing the flash duration reduces power. 
 
1/1050 sec. at M1/1 (full) output  
1/1100 sec. at M1/2 output  
1/2700 sec. at M1/4 output  
1/5900 sec. at M1/8 output  
1/10900 sec. at M1/16 output  
1/17800 sec. at M1/32 output  
1/32300 sec. at M1/64 output  
1/41600 sec. at M1/128 output 
			
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 Thanks Stephen 
Changing the power output does make a difference.