<< I got one of those AA-size models from some other offer a while ago, and the bulb burned out! How hard are these to replace? Does Mag have their own "proprietary" bulb technology? >>
They use regular bulbs that can be found at most stores. Radio Shack has bulbs and probably Wal-Mart too. Get the Krypton bulbs if you can. Brighter and better. Also, most Mag Lites have an extra replacement bulb in the bottom cap under the spring. It will be wrapped in some foam. Look in there before you buy new bulbs.