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			 I would say that the ballast is usually matched to the tube, so in most cases you can only use one size of tube.  There are some special ballasts that will run a varity of tubes, but in this case that is probably not true.  
		
	
		
		
		
		
			
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	Bob ----------------------------------------------------- To be loved you have to be nice to people every day - To be hated you don't have to do squat. ---------Homer Simpson--------  | 
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