SureFire KX2C LED Conversion Head Black 200 Lumens of Max Output for 2 Hours Solid-state LED generates 200 lumens of blinding white light; produces tactical-level lighting for two hours on a set of two SureFire 123A batteries Fits Scout Light, L4, E2D, E2D LED, E2E, E2L Outdoorsman, and all previous 2-battery E-series flashlights