Helmet lights are small, portable lighting devices that can be attached to helmets, providing hands-free illumination for various activities. They are commonly used in outdoor sports, construction, and emergency services, allowing users to see clearly in low-light conditions while keeping their hands free for tasks. These lights typically feature adjustable brightness settings and may include different light modes, such as steady or flashing. Many helmet lights are powered by rechargeable batteries and are designed to be lightweight and durable, making them suitable for rugged environments. Popular brands include Petzl and Black Diamond.