Posted 13 January 2018 - 02:11 PM
He may be thinking of gen one type of headlamps. Concerning the "driveway test", when I start my MKX, the headlights "exercise" (for lack of a better word), swinging extreme left then extreme right to test the adaptive function. Because they swing to illuminate the turns through mechanical means, I doubt that it would be necessary when the new LEDS switch electrically, and, therefore nothing would happen in the driveway.
In my opinion, the advantage of using LEDS over Halagen or HID is less heat, less current (smaller wiring, less money), no mechanical contraption to be concerned with, and you retain full brightness straight ahead while also illuminating the turn.
While the cost seems rediculus, the development of the lights needs to be recovered. Have a friend who designed and developed an add-on third brake light (intended for older pick ups). Simple little light, plastic housing, red lens, prewired socket and bulb. He spent OVER $50,000 developing the red lens. It takes a computer and special machine to get the little dimples exactly right for the correct illumination pattern. Also a special lab to get the exact color match for the red. All of these tests and certifications are necessary to get DOT certification. (And all state laws require that any light used on a motor vehicle be DOT certified.) (BTW, those are mid 1990's prices). The price is for several different companies work in developing the LED fixture. Very exacting work.