Terralux TLE-6EX MiniStar 5 LED Upgrade Conversion Kit, 4-6 cell C & D MagLite by TerraLUX LED FLASHLIGHT REPLACEMENT BULB  replace or upgrade your regular flashlight bulb with the TerraLUX by Lightstar Maglite LED Conversion Kit. Convert it into a bright & long-lasting flashlight FOR USE WITH YOUR MAGLITE FLASHLIGHT  1 Pack. Designed for use with your 4-6 cell C and D MagLite torch. The bulb is electronically regulated for exceptional battery life BRILLIANT WHITE LIGHT  140 lumens, this upgrade lightbulb is super bright and emits a consistent light output SUPER EASY TO INSTALL  unscrew flashlight head & retaining collar. Remove incandescent bulb & drop LED Conversion Kit into bulb socket. Replace collar & turn clockwise. Replace flashlight head EFFICIENT, BRIGHT & RELIABLE  with a 33 hour max runtime, the bulb is super reliable & helps to extend the battery life of your flashlight so that you have light when you need it. LED wont burn out