KPR13 Krypton Flashlight Replacement Bulb - Description - 4.75 Volt - 0.50 Amp - B3-1/2 Krypton Single Contact Miniature Flanged (P13.5S) Base - C-2R Filament Design - 2.5 MSCP. - 10 Average Rated Hours - 1.25" Maximum Overall Length - 0.45" Maximum Overall Diameter. KPR13 Krypton Flashlight Replacement Bulb