If illumination is a big concern, you might want to avoid the "one eyed Burgmans". They have one headlight as low beam and the other as the high beam (as its normally off, hence the term "one-eyed"). The '07 Burgman 400 was one-eyed, but they switched to a traditional two-eyed (both headlights have high and low beams) in '08 and on. I'm not sure about the pre-'07 400s and I think all 650s were two-eyed.
However, I've never had a problem with my one-eyed bike, but I don't do a lot of night-time riding. Good luck. The burg is a great bike.