You'd probably never be called out for it, but keep in mind, any lamps used on a vehicle registered in the USA is supposed to have DOT approved fixtures/bulbs in key, critical locations. Headlights are one of those critical locations. Physically fitting doesn't mean it's a DOT approved bulb or housing. Now, some of the rules we have for lighting are way behind the times. In headlights, the BMW adaptive laser beam headlights available out of the country are MUCH more capable than those sold here. THere's a (current, hope it eventually gets changed) rule that requires a hi/low headlight switch. Those headlights in Europe, for example, do not have that simple switch and the beam shape and intensity can vary almost continually to adjust to the prevailing conditions. To get the laser headlights we now have, the FDA got involved, and forced an additional functionality that requires a housing breakage detection system to shut the laser down if the lamp housing is damaged (FWIW, the laser beam points backwards, not towards the front of the vehicle on the BMW design, and energizes phosphors to make the visible light). Sometimes, I think we have too many rules and regulations, but hey...it is what it is. It took years to get halogens, then xenon, then those that could move to show around corners...we're years behind the rest of the world.
A typical LED bulb tends to have a very splotchy light pattern, which can lead to eye fatigue. It takes some engineering and customization to make one work well and be backwards compatible with an incandescent or halogen bulb designed fixture.
2011 535i x-drive GT, 2014 i3 BEV