I have 7 used but working 50W halogen spotlight bulbs with a GU10 base. They are a standard fitting for many small domestic downlighters. They are 240V with a 35 degree beam width. Here is a link to a retailer's web page that shows pictures etc.
https://www.lampwise.co.uk/osram-64824-fl-50w-240v-36-gu10-halogen-flood-sp...
Halogen Spotlight bulbs (IP5)
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