I carry a backup Photon II in amber or white in my backpacking kit. When space isn't at a premium, the light weight of the Photon makes it attractive to double up on, rather than carrying spare batteries and messing with the tiny screws.<br><br>I learned from experience that when using a red light at night, it's very difficult to determine whether or not your're bleeding. You can't see the blood. Makes it difficult to find and treat little boo-boos. The white light solves that, at the expense of your night vision.