I shopped for mine on eBay.
Seeing some Chinese knock offs at roughly £1 a piece, I bought few.
They're H1, 100W (yes, 100W), with blue coating giving almost white light.
And the biggest surprise: before I was using Philips from halfords and had to change a bulb every 4-6 months. I bought Chinese ones some 2 years ago and still have 2 as spares- first couple didn't blow yet..
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