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Just some additional information :

Depending on the inside mirror small halogeen spots produce different lightbeams.
The filament size is important also : the smaller the filament, the narrower...

Hello djdjdj

I'm not too sure what you mean with 'three prong plug'.
Halogen lightfittings are made either for low voltage lamps, or for 240 Volt lamps.
And never are these different voltage...