I saw something last night by accident, I am a huge fan with red light as my eyes can adjust from night vision after half an hour to see better at night using a head lamp... but red doesn't bounce or reflect off of rocks, it just illuminates. Green appears to offer a better return at night off of objects. The difference appears when someone else is holding the light from a different angle. I was looking for support here I can build the better headlamp, SO although I have been brought up to say a red light in a darkroom is best, the Green might be better for hiking..... Thoughts anyone? diag.JPG