1. MV Motorrad makes a set of halogen fog/auxiliary lights for the R12R that are superb. They are VERY bright, solidly made and - - perhaps best of all - - very inconspicuous, so they don't ruin the simple, clean lines of the bike. The housings are fairly small, matte black and mount under the front shoulders of the tank. (They attach very solidly to existing metal tabs inside the lower front edges of the tank, so there is no separate mounting bracket to mess with or clutter up the bike.) The lights blend perfectly into the bike's profile from the front, and you can't even see the housings when sitting on the bike. This medium-high mounting point also beats the heck out of lights mounted on the lower fork legs like some, throwing the beam further. I highly recommend these lights. Last I looked, they were $168. Don't recall where I found them; it may have been A&S Cycles in California. If you search "R1200R fog lights" on the Internet, you'll find them.
2. Mounting tip: The lights come with mounting instructions which are OK but not great; the verbiage is a bit confusing, so you have to go mostly by the photos. An experienced BMW mechanic should have no problem. However, there is an on/off indicator LED for the lights with a lead running from the switch. The mounting instructions suggest drilling a hole in the headlight dimmer switch housing and running this lead through it, so the LED sticks out of the housing. DON"T DO IT - - this will allow water to enter the housing. Instead, just run the lead along the clutch fluid & headlight switch wires coming up from the headlight (zip-tying the bundle together) and thread it (coming up from the bottom) between the inside edge of the headlight switch housing and the outside edge of the mirror mount, with the LED tucked into that gap on the rider's side. Very sweet - - no drilled/leaky headlight switch housing and no loose or floppy wires, LED easily visible to rider!
3. FYI, the auxiliary lights will come on when the bike is started, but can be turned off simply by double-clicking the bottom of the hi-lo beam (headlight dimmer) switch. Neat, huh?
Hope this helps.