I just got some H4 LED replacements. Vastly better than the standard bulbs and less current drain too but not up to modern all singing, all dancing purpose built LED standards.
To follow the letter of the law you cannot put LED bulbs in a unit designed for halogen. The LEDs wont be E marked & likely marketed as off road use only. To fit LEDs you need a complete lamp unit.
There is a loophole for pre 1968 ( I think) vehicles so I did fit some to my 1930 Sunbeam. I can now see to drive at 40 mph rather than 30mph & the dynamo can keep up. I still avoid driving it after dark.
