Voltage droppers are built into the LED 'bulb' base Stephen.
How long have we all been looking at Volvo's DRLs, since some time in the 70s?
It was going to come sooner or later, whether there will be a requirement for retro-fit is a good qustion. I modified the front parking light on my BMW R100RT (1982 vintage) to run a 20W lamp as a DRL in the fairing, many years ago. Whether it helped is anyone's guess. When it does become law, those without DRL will be even more hidden while out on the road...
As for the current Audi DRL

B. awful.
Cheers,