I have seen first-hand the difference between a Xenon-Krypton MagLite flashlight and the Cree flashlights, and side-by-side, Xenon-Krypton will blow away the Crees in terms of both brightness and runtime. A Xenon-Krypton MagLite Flashlight running on three AA-size Alkaline batteries is retina-burning bright but can run nonstop for more than 12 hours and is the only kind of light I will ever use when working on my car or bicycle in low-light situations. Xenon-Krypton are the HIDs of the incandescent light world. They easily outshine a Cree flashlight, last a lot longer on a single set of batteries, have more down-road and side-road visibility, and they don't call Xenon-Krypton lights "night suns" for no reason.

Here: http://www.ehow.com/about_6160543_xe...ashlights.html

Xenon lights shine the brightest compared to any other type of light including LEDs and provide the most efficient use of battery power and are often much cheaper than LED flashlights. Xenon lights also emit a light that is very close to actual daylight in terms of light quality, and the human eye is more tuned into the 4000K and higher color temperatures of the Xenon lights, so the human eye can see better with a Xenon light than it can with any other type of light.