The lights are crap on the 1150GS, but before going the route of more expensive bulbs etc. just check the headlight alignment. IT now its obvious and you might already have done this, but many people haven't/don't . . . and it makes a big difference (even though they just end up less crap, but crap none-the-less.
The adjuster sits behind the cowling on the left hand side. Pull the lever to horizontal and play with the fine tune adjuster. Go to a very dark but level unlit lane one night and fiddle with the adjuster to get the beam to throw further up the road. It helps. They seem to come from the factory with the beam set to point about 6 feet in front of the bike. This is often not sorted at the PDI.
Might help.
Simon E.