The best bike lights are a cycling essential, whether you're commuting through city streets or blazing trails after dark. There's a wide array of lights to choose from, with options ranging from budget-friendly urban blinkers to car-headlight-style bright beasts. We tested dozens to help you choose the best lights for visibility, battery life, and budget, whatever your riding style. Bike lights serve two purposes: to see and to be seen by other vehicles. After this, check out the rest of our guides to the Best Electric Bicycles, the Best Bike Helmets, and the Best Bike Locks.