Just want to add that the LED headlight technology is here now, Honda/Acura and Toyota has them in their cars, I'm sure the design of the headlights are different than halogen type. LED for the aftermarket just not quite there yet.
LED is definitely there OEM. The Escalade had it years ago on their Platinum package. The new units are direct driver/lens combinations and are insanely bright. The new BMW/Mercedes/Jaguar ones are insane and put all else to shame. I've never seen such a sharp cutoff on ALL sides of the beam. It looks like someone drew a beam pattern on the ground and the light fills it exactly.
Yeah, I'm aware (and somewhat jealous) of the OEM LED awsomeness out there. This being a thread about a plug-in retrofit, I thought it was clear that this was what I was talking about, but I see now that it wasen't. Thank you guys for the clarifications!