LED Flashlight Pr2 P13.5S 3W 4-24V. Available in White 6500K. Fits popular flashlights. Replace broken incandescent bulbs with almost unbreakable led bulbs. Long life up to 30,000 hours. The ring is 13.5mm. The length is 14mm. Starts to illuminate at 4.36 volts. Full brightness from 4.36 volts to 24 volts. Uses approximate .453 amps @ 4.36 volts. Uses about .090 amps at 24 volts. Includes 2 per package.