Extra lights can serve several functions on a motorcycle.
Generally, auxiliary lights come in a few different types. Which type you would choose depends on your purpose. Here's what different types of driving lights can do for you:
When choosing driving lights, you must also consider how you're going to mount them. The ST1300 fairing is very tight against the various parts of the bike, and not at all structural. You have only a few options:
The ideal position for white lights is at your eye level, just behind your eyes. Of course, you're not going to be mounting your driving lights on your helmet, so we must find a suitable compromise. The further away the lights get from eye level, either above or below, the more your lights will cast strange looking shadows that will confuse your depth perception. This is a much more serious problem off road than on road, but even on the road it is something you should think about.
The ideal position for fog lights is low, about a foot or so off the road. The low mounting position minimizes direct reflection of light back into your eyes, so you get the least possible glare.
In this section I list some mounting options first, and some light options second.