Not much help but I have a 2012 XR and it states a 48 amp alternator. My Victory light bar came with two 25 watt bulbs and the first one didn't last 2 days. I stopped at O'Reilly's and bought 2 55watt replacements. About 800 miles later, all is well. No drag on the alternator at idle. No change in brightness from off to on or vice-versa. I can't help but believe you will be fine.
2012 Crossroads - Stage 1 Flash - D&D Exhaust - CR Analog Tachometer - Victory Light Bar - Cruise Control - Lock N Ride Passenger Backrest - Lower Air Controls - Dipstick Thermometer - CHROME - Front & Rear Fender Rails, Heel Toe Shifter, AN Billet Grooved Engine Badge Set, Cam Chain Adjustment Covers, Saddle Bag Rails, Ness Diamond Band Grips & Pegs, Victory Logo Mirrors, Tube Highway Bar and Clutch Arm Cover