For high efficiency, energy-saving, bright white LED light for standard D and C 3 to 6 cell aging Maglite flashlights, use the ABN® LED Maglite Flashlight Replacement Conversion Kit Upgrade Bulb, 2-Pack, LED D & C 3-6 Cell 200 Lumens of Bright White Light. (D and C = battery sizes, 3 to 6 cells = number of batteries in flashlight.) This LED bulb has a 100,000-hour life and even extends the flashlight battery life by 20 hours. To install, simply unscrew the flashlight head, remove the retaining collar and old bulb, insert the new LED bulb, and reassemble while ensuring that the flashlight has good batteries and the anode is inwards. The replacement bulb offers an even beam pattern when adjusted from spot to flood, prevents overheating, and is shock resistant. This package includes (2) bulbs.