Led bulbs are the same , left or right drive . It’s the reflector/ Lens set up that makes the difference.

So would they be acceptable in a RHD car with the reflector/lens set up for RHD?

Many older RHD cars having H4 bulbs, had a front lens with a section designed to throw a part of the dip beam up and left.

I understood the H4 dip beam bulb mirror (at least) was canted over, depending on the market.

Led bulbs are the same , left or right drive . It’s the reflector/ Lens set up that makes the difference.

Not necessarily applicable to these Philip's bulbs. I helped our french next door neighbour fit some Philips leds to his car. They have a degree scale etched on the front of the adaptor ring left 45 - 0 - 45 right etc and a very small locking hexagon socket grub screw locks the adaptor ring to the body of the bulb, they come in the box set at zero with a 1.5 mm hexagon (allen) key supplied. The adaptor ring is the part that fits in the H1 recess in the headlamp. We fitted them set to the zero mark and they seem to be fine on my beam setter. ( the inside of the barn doors painted white with a centre line marked on the floor).

Maybe Philips are setting this up for the future so that to fit X bulb to Y car set scale to Z degs left or right?

Edited by focussed on 15/11/2022 at 23:00