OldBiker
Wizard
Maybe it the PIAA bulbs I use but it's happened a few times.
Back when Halgens first came out I installed one in my Suzuki GS750. Loved it until one day I started the bike and the bulb popped (yes this was when the manadtory lights on was in force, 1976). Bought another bulb and it popped too. Turned out that the battery electrolite level was low so the alternator was kicking out some high amps which fried the bulbs. Filled the battery and all was well.