One thing about twilight. If you sit there and let your eyes adapt to the dark, you can see surprisingly well. Combine that with the ability of your feet to sense when they are on the path or off trail (there is quite a difference) and you can travel surprisingly well. If the moon is up and/or the stars are out, in some ways you are better off not using a light at all, or just using it sparingly. I have been able to read a newspaper on a clear night with a full moon.