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Thread: Xenon headlight

  1. #1
    Registered User WalterK75's Avatar
    Join Date
    Feb 2009
    Mississauga, Ontario

    Xenon headlight

    I see in the price announcement link from the home page that there are two descriptions of the xenon light. What's the difference?
    1: Xenon headlight with dynamic leveling
    2: Xenon adaptive headlight

  2. #2
    Registered User
    Join Date
    May 2007
    Western NY
    Dynamic leveling adjusts the beam up and down depending on the attitude of the bike. If you load down the rear and raise the front, the beam would normally be aimed too high and blind oncoming drivers. Dynamic leveling adjusts for this and is required by federal motor vehicle safety standards. BMW isn't doing anything extra here.

    Adaptive lighting slews the beam left or right in a turn so the beam is actually looking into the turn. I believe the BMW system uses mirrors (but no smoke).
    2007 R1200ST

  3. #3
    Registered User mneblett's Avatar
    Join Date
    Nov 2005
    Fairfax, VA
    Quote Originally Posted by kthutchinson View Post
    I believe the BMW system uses mirrors (but no smoke).
    Correct -- the HID bulb is fixed (actually facing upwards) and there is a ~2x2 movable mirror above the bulb set at roughly a 45 degree angle to reflect the light forward.

    IIRC, on base models, the mirror pivots up/down to compensate for suspension height changes, while on the adaptive headlight models the mirror also gains motion about at least two axes to permit it to reflect light to the side and upward enough to stay on the road in response to the bike's attitude determining electronics.
    Mark Neblett
    Fairfax, VA

  4. #4
    Daily Rider jurgen's Avatar
    Join Date
    Dec 2006
    Red Rocks
    It appears that the "Safety Package" contains both the adaptive headlight (leveling and pointing into the turns) as well as the dynamic traction control. Both systems are fed by the gyroscopic lean angle sensors so it would make sense to offer these options bundled together. Dynamic leveling is included in the base packages - perhaps the sensor for the leveling function is separate.
    Curious why customers have to pay extra for the safety package. Anything safety related should never be optional, IMHO.

    Still, amazing technology for a motorcycle.
    Red Rocks
    04 R1150GS adv
    04 K1200RS last of the great bricks

  5. #5
    The dynamic leveling feature is based on the compression of the front/rear shocks.

    The adaptive headlight feature is based on the lean angle and speed of the bike, using the gyro and speed sensors.

    So there are two similar but separate information feeds used here, one controlling the up and down motion of the mirror, and the other controlling the side to side swing.

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