I've found that using a flashlight is better than crashing around in the brush that you can't see, assuming you're going cross country and not walking down a clear trail. I either use a small hat-mounted light, or aim a small LED light immediately in front of me. If you're illuminating a small spot 3 feet in front of you, it's hardly visible from more than a few yards away. After all, there's no need to shine it up ahead into the woods 50 yards in front of you.