Chris,

While a light is certainly a great thing to have, if you were taking something and didn't know how long you would be out, you might want to reconsider your Surefire and consider an LED. I love my Surefires, but damn they eat batteries fast. So I would suggest either the LED lamp for the Surefire or a separate LED light for longer duration in a potentially battery-poor situation.

Just a thought...

Greg