CREE XM-L2 U2 LED Bulb 1 Mode 1000 Lumens 3.7V-18V for Flashlight Ultrafire 501B 502B Surefire Surefire 6P 9P Comes with a lifetime warranty if purchase through ArizonaTacticalGear Newest CREE Bulb / XmL-U2 1 Mode Runs 15% Brighter & 15% More Efficient Than The XmL-T6 Save batteries with 2-3 times the run-time over normal incandescent Never buy bulbs again - LED lifetime over 100,000 hours Smooth reflector for extreme ilumination distance and tightly focused beam