PR13 Standard Flashlight PR Replacement Light Bulb: Description - 4.75 Volt - 0.50 Amp - B-3-1/2 Single Contact Miniature Flanged Base (P13.5S) - C-2R Filament Design - 2.20 MSCP. - 15 Average Rated Hours - 1.25" Maximum Overall Length - 0.45" Maximum Overall Diameter. Typically found in 6.0 volt lanterns. PR13 Standard Flashlight PR Replacement Light Bulb