Nite Ize LED Upgrade Bulb for D & C Cell Maglites. Environmentally Friendly - Minimizes battery waste and bulb replacement waste Extends battery life - Save money! Reliable and efficient L.E.D. technology As simple as replacing original bulb Self-adjusting for all capacity levels - compatible with 2-6 cell 10 year lamp life - 100,000 hours of continuous use Focus: Spot to flood Pure white light - Bright white L.E.D. Dependable - Shock resistant!