I have a 2004 K1200GT. Has anyone tried installing LED headlight bulbs in this model? I can find nothing on the internet.
I did a quick search and found:
DIsclaimer: I've never bought from them, I just provided you with a link to LED bulbs like you requested.
I have not installed LEDs on a 2004 K1200GT. I have however, installed HIDs on my 2007 K1200R Sport. I found them on Pirates Lair: NSSC HID Headlight Conversion Kits from Pirates' Lair at 828.628.7093 EST
For your model Bike they also offer all these things: Pirates' Lair: Aftermarket, Custom, and Performance MC Accessories for the BMW K1200RS/GT
What's the difference between LED and HID? Power values... Light Emitting Diodes consume less power than High Intensity Discharges buuuut, tend to produce more heat, weird right? LEDs end up needing a heat sink and sometimes even a fan (Which makes overall power consumption rates questionable). Think of the HID as an incandescent light on steroids with a wireless filament. The arc of the spark is what creates the illumination as it traverses the hermetically sealed gap filled with Xenon (almost always) or other types of Noble or Halogen Gases (very rarely). While HIDs require a ballast to produce a high rate and constant flow of power, the most draw is produced at the initial ignition of the bulb, after it "warms up" power draw is reduced and constant brightness achieved.
Be advised, in case you were unaware, your model Motorcycle uses two types of different bulbs: H7 for low beams and H3 for High Beams. Searching for that syle LED bulb might yield better results.
Also, beware with LED and CAN Bus incompatibility issues. I do not know if your year/model bike has a CAN Bus system, mine does. Normal bulbs draw a bit more power, sending back particular values to the CAN Bus system to let it know that the bike is operating properly. When replacing with LEDs the values decrease due consumption reduction and this will signal false errors.
I wish you the best, Good luck. That website I first linked calls a work around to the LED Issue a "Canceller & anti-flicker"