Guess: it was a coincidence. Or partly coincidental, anyway. Perhaps you jiggled the headlight assembly enough when mounting the guard that a weakened filament gave way.
The Piaa lamps are, IMHO, quite overpriced. Especially for our bikes as the H7 bulbs (all brands) don't seem to last very long. I'm getting about 10,000 miles per bulb using the VisionPlus (about $17/bulb). The stock bulb lasts a little longer, but I prefer the slightly more light that the VisionPlus puts on the road. I make it a point to always carry a spare.
// marc
|