PR3 Standard Flashlight PR Replacement Light Bulb: Description - Standard replacement flashlight bulb - 3.57 Volt - 0.30 Amp - B-3-1/2 Single Contact Miniature Flanged Base (P13.5S) - C-2R Filament Design - 1.50 MSCP. - 15 Average Rated Hours - 1.25" Maximum Overall Length - 0.45" Maximum Overall Diameter - Typically found in flashlights using three "D" industrial cell batteries.PR3 Standard Flashlight PR Replacement Light Bulb