What is the difference between bulb 3157 and 3157L?

The primary difference between the 3157 and 3157L bulbs lies in their brightness and application. The 3157 bulb is a standard dual-filament bulb used in various automotive lighting applications, while the 3157L (where "L" stands for "long life") is designed to have a longer lifespan and typically features a lower brightness output compared to the standard 3157. This makes the 3157L ideal for applications where longevity is prioritized over brightness. Always check the vehicle’s specifications to ensure compatibility.