The Nite-Ize 1 Watt LED Upgrade Kit converts most C & D (2-6 cell PR style flange) incandescent flashlights into super-bright, long lasting (50,000 hour) LED flashlights. It’s as easy as replacing the bulb – and instantly, your flashlight will emit a pure white light (as opposed to the incandescent dull yellow), in spot to flood focus. Self-adjusting for all capacity levels, this 74 lumens, shock resistant, efficient LED technology, also conserves battery use, making it not only a useful, versatile improvement, but an environmentally-friendly one as well.