I don't have a good in action shot. In this pic, I don't have the bag on...but the mount is still there and the little silver/black bump on my handlebars is my HRM/computer mounted to that bar. You can kind of see how high up it sits. In the case of my bag (the small one), I'm pretty sure that a light would shine over the bag and work just fine. H has the bigger bag and in pictures I've seen of his, I don't see how it would work. I'm pretty sure that's how he uses it though, so I can take a closer look at his set up when I get home tonight.