Many cars from the late 1960s onwards with quad headlights have H1 bulbs in either the high beam or in both beams. This high power LED conversion can transform the performance. The light is ivory in colour, so does not have the blue tinge associated with new cars, but these units produce a 250% increase in light output while reducing the load by 60%.
Like all high power upgrades they are bulkier than the halogen original bulbs and you can see a comparison in the pic below, but if you have, or can make the room, they are spectacularly good. They come with a market leading 5yr warranty against fault of failure and a money-back guarantee. The price is for one kit of two bulbs.