The Malkoff Devices M60 LED Drop-In Module features a patent-pending solid brass heatsink, fully-potted electronics, and optical beam projection (not a reflector).  The optic provides high quality illumination with a nice balance between throw and spill.   It fits many SureFire flashlights including 6P, 9P,  G2, G3, C2, C3, Z2, G2Z and their variants.  The output is 235+ lumens out the front with a runtime of 1.5+ hours on 2 123A lithium batteries.  Made in USA.