I have a headlamp (Black Diamond Sprinter) & a bar mounted light (NiteRider MiNewt 350-although f I were buying it now, I'd go with the 600-it wasn't out when I bought). The Sprinter is OK. If I had to, I could get home with just that light & it would probably work fine if I lived in an area with lots of streetlights. I have one major hill on the way home from work & I would need to slow way down to navigate it on the headlamp's beam. I get a much better field of view with the NiteRider.

I don't know the specs on the sprinter, but you can probalbly look them up & see how it comapres to the headlmap you are thinking about. I bought the Spritner for running at night & it works great for that. I wear it when I ride at night, since like was mentioned above, the extra light isn't a bad thing (it also includes a flashing taillight so that's nice on the bike).