A100 rides again..

[Nobby the Bastard]

He actually did it with that in mind. All three bulbs in the demonstration were halogen but there was still a marked difference between the generic and high end brands.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[A100man]

Found one! I think..

P15D-3 fitting. https://www.ebay.co.uk/itm/175027443970?
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Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[stinkwheel]

That's a numb bulb type. I wonder if it would be worth fitting an H4 sealed beam insert in your headlamp shell. Fucking on with pre-focus bulbs won't be helping the effectiveness of the headlamp either. Usually sold by diameter in inches, you get the reflector, lens and bulb holder (+ or - pilot light) for £15-20.

EDIT: I can also say with a great degree of confidence that that bare chip-on-board LED bulb on ebay you posted above will not give you a good beam pattern and will likely fail in fairly short order. No focus, no directionality, no damp protection and no heat sinking. You can get decent P15D LED bulbs but without the 3-lug base, it might be possible to press the base off an old one and swap them over. But I'g go for an H4 conversion if you can justify the cost.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Easy-X]

There are such things as LED sealed headlamps but fuck, they're expensive. The cheaper alternative would be the usual 5 3/4" and 7" cheap chinese units but they'd not match the aesthetic of the A100. (If one was switching to H4.)
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter