Had a bit of play with the light on mine since I've had it.
I swapped my old DRZ400S for the XChallenge about 2.5 years back and had an H4 Hi/Lo conversion in the DRZ that was a huge improvement, so I hoiked that out before I sold it on and eventually, after realising the lights on the XC weren't as good as they looked they should be, installed it on the Beemer.
I managed to squeeze the kit in behind the right hand panel, though it was a real tight fit. There were some problems though as a few others on here and ADV Rider have experienced too. The initial "igniting" of the ballast would play havoc with the (already slightly fragile in my opinion) electrics and 8 or 9 times out of 10 would cause the instrument display to power off for a second or two when I turned the key on. Not a massive problem, but it did mean it would reset the clock and wipe any trip meter, and hence fuel status, settings. Not that great. It was nice and bright though.
I put up with it like that for a while and then some water must've got in there and the whole thing began to cycle on and off while I was riding the bike. Fortunately it was daytime, but basically I got home an uninstalled everything!
Currently I have a Philips Blue Vision H4 or whatever they're called in there and it's marginally better than a standard H4.
I also fitted some small LED Cluster lights up front on the mudguard. They're so small that there's just enough room to turn full lock without fouling. They're good and bright but don't "project" much light so are more to help other people see me rather than to help me see if that makes sense.
Last year I took part in the Hard Alpi Tour, a 24 hour 330 mile ride through the Italian Alps with 70% done on trails. The organisers specify that extra lighting is a good idea, so I set about looking in to it all again.
What I ended up with was a pair of 2 small LED Spotlights which I've mounted on to the TT headlight guard bracket and sit either side of the headlight. They're aluminium housings and identical in appearance to the ones sold by adventure-spec and the likes but, at the time I bought them, they were £15 each rather than £100+ each! Looking again now 9 months or so later, you can pick up a pair for under £20 delivered on
Ebay!
You can talk all day about beam pattern and the likes and I appreciate that I really do, and I'm sure the Vision-X's etc are better quality, but for my £30 I'm really happy with them. I've got them wired in to come on with Flash/High Beam and also have a separate switch so I can turn them off altogether if I so desire. They made a MASSIVE difference on the pitch black trails of the Italian Alps in the early hours of the morning, I'd have really struggled without them I think.
Can't find any decent close-up pictures, but I can take a snap later if anyone's interested...
You can see the small cluster LED's lit up here and the Spots either side of the headlight.