Solar porch lights don’t last forever. The average lifespan for a solar outdoor light is 2 to 4 years, but the good news is that it doesn't always require a full replacement. Other factors influence how long your solar lights will last. Those factors include the type of lights and the weather conditions they’re exposed to. Some LED solar lights can last up to a decade. The key is understanding when it’s time to switch out parts. If your solar lights appear dimmer or aren’t performing at an optimal level, keep in mind that you don’t always need a full replacement for your lights.