What are the advantages of low-voltage light bulbs?
Low-Voltage incandescent lamps can withstand significantly-more vibration than high-voltage lamps.  This is because the filament is thicker, which makes it more sturdy.  

This property of low-voltage incandescent lamps is one of the many reasons that 42 Vdc vehicle electrical systems never became popular.  There are other reasons - this was just one.