That's the exact setup I'm using, and it fits my needs perfectly - be-seen visibility just before sunrise on a wooded street. My commute has enough light to see, the Fenix is more than enough to be seen for a long way. The light is very bright head on. It is also very bright after dark - enough that I plan to commute with it on the way home into November. The beam has a sharp cut-off, which some do not like. I may add a smaller Fenix light for the helmet if needed.

If money were no object, I'd get a DiNotte. The Fenix meets my current safety needs for ~$80+ less.