My headlight keeps burning out, lasts about a couple thousand miles and burns out again. 1976 FLH stock headlight bucket. the charging system is ok charging 14.2 volts or so, it seems like it is just the vibration that burns it out. The bulbs I'm using is a standard auto light, sealed beam halogen bulb. Is there a type of bulb that will be better? LED, standard filliment type bulb?