The BrightSource Ford Super Duty Quad Headlight LED headlight bulb upgrade kit is designed to improve the light output of the factory supplied headlight system. The BrightSource Reversible Base LED Heatsink Kit powers a much brighter, whiter light output than stock H13 (high/low beam) headlight bulbs. Our Ford Specific wiring harness maintains your Daytime Running Light function (where applicable) without flickering or light out messages. The BrightSource Ford Vehicle Specific Kit is an easy to install, plug and play, headlight bulb upgrade solution. 4000 Lumens, 6500K Color Output, 50,000-hour bulb life. Reversible base provides greater clearance with tight installations. Bulbs can be adjusted for perfect alignment with headlight reflector using the included allen key. Two Year Limited Warranty on Manufacturer’s Defects. This kit comes with bulbs for all four headlights.