SureFire KX9 LED Conversion Head, Anodized Gray Virtually indestructible LED generates 500 lumens of blinding white light; produces tactical-level lighting for 1.5 hours Fits 3- and 6-battery 9-volt incandescent and LED flashlights and Weapon Lights (see Product Description) TIR lens creates smooth, single-output versatile beam with plenty of reach and surrounding light to accommodate peripheral vision Construction - high-strength aerospace aluminum with Mil-Spec hard anodizing; coated, tempered window O-ring sealed for weatherproofing