This worth a read. Couldn't find the original RIDE article (2010), but this annotated version gives a fairly good insight into the differences between the main headlamp bulb manufacturers based on the results of a relatively scientific test using an FZ1 headlamp unit.
Quote:
Originally Posted by
XT Donkey86
is there any brands to avoid
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Perhaps not surprising was that the OE Yamaha bulb was crap, but they also found Halford's own brand bulbs to be pretty rubbish too - there's one to avoid I guess...