You could fit some driving lamps ?
I have three pairs of light brackets here, specially built for the Tenere. As I'm about to work on an updated design you can have a set for �15 delivered (UK)
Halfords do cheap lamp sets that will fit ->
http://www.halfords.com/webapp/wcs/s...egoryId_165688
You can fit the brighter bulbs, some are better than others, and you might see some improvement (I saw a little), but it's not the output that is the problem it's the reflector array - it sucks! You've probably already noticed that when you align your dip, the main beam is out. The trouble is the relfector is one piece and not very well designed.
You can also fit HID kits, the guys who have these love them, but be aware that they do not conform to regulations in that you need to have automatic leveling and a power wash fitted.