I think it's best to carry a red LED flashlight separate from your white light. It can be as simple as a keychain coin cell light and will still last a very long time. A red led produces red light directly, as opposed to a filtered white light which burns a lot of battery power making a full spectrum, then throws away 90% of the energy by filtering it. If you want something sturdier than a coin light, try a Gerber Infinity Ultra (red led version) which runs on one AA cell. There is also the new LRI Proton (www.photonlight.com) which has six white leds and one red led, runs on one AA, and is dimmable (microprocessor controlled), a good general purpose light though on the pricey side for non-flashlight buffs.