The 30 lumen, 3 volt LED (light emitting diode) replacement flashlight bulb is the ideal way to upgrade old flashlights. This conversion bulb operates with any 2 cell, AA, C, or D flashlight. This bulb is a 10 year bulb, and allows for 100,000 hours of use before any change is required. The 30 lumens of light output provides greater value and visibility to older flashlights.