The 30 Lumen – 3V Led Replacement Bulb Is The Perfect Way To Upgrade Your Old Flashlights. This Conversion Bulb Operates With Any 2 Cell – Ana, 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. 30 Lumen – 3V Led Works On Any 2 Cell – Ana, C, Or D 100,000 Hours Of Life 10 Year Bulb Carded.