Interesting experiment is to put a voltmeter between your bulb & the battery.  The resistance of the wire, ignitions switch, dip switch etc causes a volt drop that loses energy.  My RF for example with a std bulb loses 1.3V.  A relay here will restore lost energy.  If I put a bigger bulb in it would be more of a difference.
As for the FXR150, they have a different plug in the back, similar to a tail light.  Also they have plastic lamp shells that may not take too much heat from a large bulb & chances are the alternator would have trouble driving it at any rate.
However it is worth checking what type of bulb you have.  Yamaha Blasters (horrible quad thing) have a 35W Halogen bulb that will work just fine in the FXR headlight if they are not already fitted.  Pull the bulb & check if it is pointy at the tip.  If it is round like a normal bulb then the pointy at the tip Halogen will be an improvement.  I’m running a couple in my FXR headlights (not fitted to an FXR though).
				
			 
			
		 
			
				
			
			
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