The Malkoff Devices M61 LED Drop-In Module features a patent-pending solid brass heatsink, fully-potted electronics, and a reflector for beam projection.  The  M61 provides high quality illumination with a nice balance between throw and spill.   The Malkoff M61 generally falls between the M60 and M60F in terms of its blend of throw and spill.  It may be installed in the Elzetta ZFL-M60 Tactical LED Flashlight with the optional lens and gasket.  It also fits many Surefire flashlights which use the Surefire P60 or P60L lamp.  This  includes Surefire models 6P, 9P,  G2, G3, C2, C3, Z2, G2Z and their variants.  The output is an honest 260 lumens out the front with a runtime of 2.0 hours at full output and a tactical beam for 10 hours on two 123A lithium batteries.  Made in USA.