From what I can see...

"Products on the lens or light source that obviously reduce the light’s intensity or change its colour will become a reason for failure – applies to front/rear position lamps, registration plate lamps, stop lamps, rear fog and direction indicators"

It does say on the listing actually,
  • only for show purposes, not allowed in the regulations
 
Yea just not sure if they change the colour of the output. And as they're from Germany different rules.