Lifesci 
  
The short answer is: all leds in one string see the same current, adding another led to the series does not change the current flow just the total forward voltage. 
  
As Kamloops-reefer said, LED groupbuy is a good resource - without having to wade through a whole bunch of info. 
		
	
		
		
		
		
		
	
		
		
	
	
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