Interesting to read that the H4 LED replacement bulb is now legal to fit in cars following a 2023 announcement.In the classic car automotive world many filament lamps now have a direct LED replacement:
Classic Car LEDs Ltd
High quality LEDs, Relays and fittings for Vintage Classic and Modern Cars, Motorcycles and Caravans at great value prices. Designed as a straight replacement for standard Incandescent bulbs. Long term Classic owners that know the benefits these LEDs bring. LED Bulbs and Globes.www.classiccarleds.co.uk