Not sure if I´ve overlooked any previous infos on this, but anyway an update on this:
OSRAM, producer of light solutions, has now legalized its LED light bulp also for the classic 7" headlights. The certification (also for other UK-made cars with the same headlamps) is, important for German TUEV as one of the toughest hurdles, officially certified for Morgans 4/4, Plus4, Roadster and Plus8.The bulp has the exact measures and sockets like the H4 halogen bulbs, and you just need to exchange the bulp, no other changes to cabling. socket, recflector or glass. It does not change the outer appearance of the headlights, beside you might notice a little darker reflector when the light is off. The light is reportedly 2.25 times brighter than H4, which I can confirm based on several night drives I´ve had during past trips to the alps.
Interesting: in hot conditions, you might notice a sound when ignition is on - coming from small ventilators of the bulb to cool down (amazing what OSRAM put in this small part).
I also like the difference of the cooler LED light and the warm-white parking light bulb, which makes the headlights an interesting view.
OSRAM is regularly updating the compatibility list for its LED-H4, and official certificates from various countries have been issued accordingly. Let me know if you want copies.
