Malkoff Devices M61 P60 Style Drop In Flashlight Upgrade Engine, 450 Lumens, with CREE XP-G LED (3.4-9V Input)
Drop-in LED Assembly (1 Mode) for Surefire M3 M500 M900 M961 M962, Nichia 4000K | eBay
Lumens Factory
Super Bright White Light Bulb, Red Light Bulb and Green Light Replacement Led Bulb Bundle, Single Mode P60 LED Drop-in Module for Surefire C2 G2 6P 9P Flashlight - - Amazon.com