I always use 'Ring' standard bulbs, very cheap on ebay. I don't think modern headlights come apart but on my XMs you could take the glass off, you could clean the reflector by very gently swabbing it with a meths soaked issue, I emphasise 'very gently' otherwise you will take the silver off, this made a considerable difference to the light output.
If we are competing for the poorest lights, my first car was a '39 Ford Prefect with a 6 volt system.
Peter
If we are competing for the poorest lights, my first car was a '39 Ford Prefect with a 6 volt system.
Peter