SureFire KX4 LED Conversion Head &ndash; For 2-3 Battery SureFire Flashlights - Replaces P60/P61 (120 Lumens) - 2011 Model - KX4-BK Black Max Output: 120 lumens; Tactical Runtime: 2-3.3 hours, depending on flashlight model Virtually indestructible LED regulated to maximize output and runtime Precision micro-textured reflector creates smooth, optimized beam High-strength aluminum construction; weatherproof O-ring and gasket sealing Powder coated, Type II anodized, or Mil-Spec Type III hard-anodized finish for extreme durability