as I reported my TR4A failed the TÜV yesterday with its LED bulb.
Not E-marked, not allowed at Germany at all but this was not the reason.
The TÜV inspector realized "no significant difference from dipped beam to main beam, just lot of light and much more lot of light".
As the TÜV inspector had a closer look through the glass and he realized the LEDs and "the wheel was off (the car)" (german saying).
Time for me for a closer look, this are the bulbs the Chinese sold my via eBay.
With LEDs on both sides, the front part of the LED for the dipped beam shielded to get no light on the lower half of the reflector.
This is 9 Volt on the dipped beam terminal, current also reduced, with 12 V it is not possible to look on the LED.
Next it 9 V on the high beam terminal, works lovely, doesn't it.
Next is a look from below with dipped beam, no light goes on the lower ground of the reflector, everything is OK.
But next is the dipped beam, 9 Volt, reduced current when I turn the bulb only a few degrees - massive light also hits on the lower reflector, passing the shield backwards.
This is only some more degrees, at all not more the 30°
The result is massive light on the part of the reflector for the dipped beam AND lots of light on the part for the main beam.
This product is not only "happy engineering" but dangerous! There is a good reason bulbs are only allowed tested and E-marked anywhere - im my opinion also at GB.
The E-mark for GB is E11.
In my opinion the construction must be different: one LED "up" for the dipped beam, on the other side one LED down, both together for the main beam.
As you can see on the 12 Volt Ba15d-bulb (only as a example for the construction).
This was a nice experiment, but I wait until E-marked LEDs are on the market.