You may find you don't need a light just to see. (Being seen is another matter, but that doesn't sound like an issue here.)
Once the leaves are off there is usually enough light to see at night. Your eyes adjust pretty quick. I run early in the AM out in the country, on dirt and farm roads, through maple and pine woods, and can easily see the occasional pothole or rut. I only wear a headlamp during hunting season so nobody mistakes me for a deer. Not that my running resembles that of a deer in any way.
If the surface is nasty, however, a light would be a good idea.
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