Center bulb low beam high beam brightness

General discussion of the BMW R1200RT/R1250RT
Post Reply
User avatar
AlreadyReadyAlready
Posts: 10
Joined: Tue Feb 15, 2022 5:41 pm
Location: Oxnard, CA
Bike Model and Year: R1200RT 2018
Has liked: 13 times
Been liked: 6 times
United States of America

Center bulb low beam high beam brightness

Post by AlreadyReadyAlready »

Hello,
I recently noticed that when my 2018 R1200RT engine is running and I have the headlight in low beam mode and only the center light is on, the center bulb seems to be very bright. When I switch to high beam mode and the left and right lights come on, the center bulb seems to dim to about 50%. The H7 bulb is single-filament. I suppose the bike electronics reduce the voltage of that bulb when activating high beam mode but that's just a guess. Anyone know?
lowbeammode.jpg
lowbeammode.jpg (310.54 KiB) Viewed 420 times
highbeammode.jpg
highbeammode.jpg (278.64 KiB) Viewed 420 times
User avatar
Doctor T
Posts: 1998
Joined: Tue Dec 21, 2021 10:21 pm
Location: west sussex
Bike Model and Year: 2007 R1200RT SE
Has liked: 1152 times
Been liked: 306 times
Great Britain

Re: Center bulb low beam high beam brightness

Post by Doctor T »

Both our cars do the same.
User avatar
David.
Subscriber
Posts: 8342
Joined: Fri Nov 07, 2014 7:29 pm
Location: North Yorkshire
Bike Model and Year: R1200RT (Camhead) 2012
Been liked: 395 times
Great Britain

Re: Center bulb low beam high beam brightness

Post by David. »

IMO, this lighting arrangement is a backward step. On a Camhead, there are two (L & R) low beam and one centre high beam H7 55W bulbs. When high beam is selected, all three bulbs remain the same (100%) brightness.
Post Reply