Rebaydo™ 2pcs LED Flashlight Bulb Pr2 P13.5S 3W 5-24V. Available in White 6500K. Fits popular flashlights. Comparable to a 27 incandescent bulb. 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. Up to 200 Lumen output. Full brightness from 4.36 volts to 24 volts. Uses approximate .453 amps @ 4.36 volts. Extends battery life up to 9 times. Uses approximately .090 amps at 24 volts. Includes 2 per package.