Motorcycles are notorious for needing the "heavy duty" filaments due to vibration. If you have a standard duty filament, that is oriented horizontally, it most likely will not last long. Motorcycle specific filaments and sealed lamps are often constructed with a vertical element and a horizontal reflector/diffuser. If you have automotive lamps, take a look at how the filament is oriented. We have to do the same thing on aircraft landing lights attached to the landing gear. If you orient the filament horizontally, you can blow a $400.00 lamp in one landing.
