Nite ize led upgrade kit for c or d cell description the nite ize led upgrade kit converts most c d 2 6 cell pr style flange incandescent flashlights into bright long lasting 100 000 hour led flashlights its as easy as replacing the bulb instantly your flashlight will emit a pure white as opposed to the incandescent dull yellow light in spot to flood focus self adjusting for all capacity levels this efficient led technology also ensures a much longer battery life making it