Where can I get a 40volt 8 watt bulb for an electric bike?

I have an electric bike with a blown headlamp bulb. It is a 40 volt 8 Watt bulb with a BA15s bayonet fitting. I am findng it difficult to source a replacement. Does anybody know where I can get one? I live in the UK and would like to source one from the UK. I would also be interested in sourcing internationally.

Answers:
The manufacturer/importer of the bike should be able to supply spares.
try ebay. or something like ring electrical..
i've never seen a 40V 8W bilb in my life.
you better try to install 3 bulbs (12V 3W), it's gonna be easier and cheaper.
you could try a 40 volt 8 watt bulb manufacturer online like "GE" or "PHILIPS"
Automotive dealers like halfords

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