I don’t know anything about dog sledding. But if your looking for a self contained head light with no extra battery pack, you might at least take a look at one of these Nitecores.
I have all three, but the last one I purchased; the HC60 : has become my favorite. I like them all mind you, but there is just something about the HC60 that puts it first; for me anyway. 
The others are the HC50 & HC30.
Edit to add:
If interested, contact M4D M4X for money saving ‘Codes’. You’ll be glad you did… :+1:
He has codes for both the CW & NW versions.