We had exactly the same problem with our GN, and so have many many others.
The supplied bulb is rubbish, and when ours blew and was replaced, the bike shop said they generally swap bulbs prior to selling them new.
In our current bikes we have just updated to xenon +50 bulbs. They are the same wattage but are so much whiter it is not funny. When approaching the bike now it really stands out which is important. I would recommend getting these bulbs to all bikers.
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