[benoa]

White or Amber LED bulbs ? Any advice ?

[reedo302]

depends on your local laws I guess. Although, my F30 has LED tail lights.

[benoa]

I was talking about the turn signals

[bmw_fascinated]

I would use amber leds because the white ones are blue LEDs with a converter. Blue leds have a good efficiency but the hotter the K-Value the less yellow/red light is in the spectrum.
So filtering out the blue part (with an amber filter) of a white LED may result in a dimmer light than using an amber led.

it should look like this:

[benoa]

Thanks @bmw_fascinated, perfect answer !