This question was asked in a slightly different form a few days ago...
There have been some experiments with LED headlights, but other than some daylight running lights, no production models yet. I think the per-package brightness needs to go up, or auto styling needs to drift away from the current emphasis on reflectors/projectors before LED headlights will really take off.
The good thing about using LEDs for headlights is you can use a combination of simple optics to get the beam pattern - a mixture of eliptical flood, wide spot, and narrow spot optics would probably replicate a headlight beam quite well without the headaches of needing an all-in-one solution. The profile could be quite low as well - a few inches of depth instead of 6 to 12.