High Power LED Upgrade Bulb Kit, Converts Most C & D, 2-6 Cell PR Style Flange, Incandescent Flashlights Into Super Bright, Long Lasting LED Flashlights, Easy As Replacing The Bulb & Instantly, Your Flashlight Will Emit A Pure White LED Light, Self Adjusting For All Capacity Levels, Efficient LED Technology Also Conserves Battery Use, Making It Not Only A Useful, Versatile Improvement, But An Environmentally Friendly One As Well.