Depending on where ur at, use a small chem light to mark ur tree or trench. Won't help missing a branch or root but the light you use wont need to as bright either.
If walking in the woods and you have a chemical light, tie or tape it to the end of a stick or walking pole and hold the stick with the light in front of you down by and in front of your feet. This way you can walk and see where you are stepping.