Sylvania SilverStar Headlights & Foglights

. 4100K Replacement capsule for HID systems that call for a D2S capsule. Includes capsule only and not the igniter. 4100k is the ONLY OEM HID color temperature. Price is for a single capsule. D2S is short for ''discharge second generation shielded''. These are found in vehicles that have projector headlamps with light shield You can spot a D2S capsule by looking at the glass -- if there is no metal shielding around the glass, you have a D2S. D2S actually provides about 10% more light than the identical D2R part. Unlike halogen incandescent lamps, the OSRAM/Sylvania lamp does not have a filament. Instead, it creates light from an electrical discharge between two electrodes in a micro-environment of xenon gas, mercury, and metal halide salts that are hermetically sealed in a tiny quartz capsule. The arc tube is encased in a glass jacket to filter ultraviolet rays. The light is emitted by an electrically energized gas -- a plasma discharge -- formed and sustained between two electrodes. The Luminarc system includes an electronic ballast that controls the arc ignition process and sustains the arc in normal operation.