The Optimum Series 4 single and dual beam LED headlight bulbs and drivers are backed by a Lifetime Warranty against defects. A lifetime warranty on bulbs that are already built to last for years, means you will probably be trading in your car before needing to buy another set of LED headlight bulbs.
On the very rare occasion one of our LED headlight bulbs stop working, there is a small amount of troubleshooting you will need to do to find out what needs to be replaced. The defect rate is so low, it probably won’t be the bulb. It may be a bad driver, loose/broken plug on the vehicles wiring harness, or a bad fuse.