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.
         
         
        
 
         
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               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...