Light output refers to the amount of visible light emitted by a light source, such as a light bulb or LED. It is typically measured in lumens, which quantifies how much light is produced. Higher lumen ratings indicate brighter light, making it easier to illuminate spaces effectively. Different types of light sources have varying light outputs. For example, a standard incandescent bulb may produce around 800 lumens, while a compact fluorescent lamp (CFL) can generate similar brightness with less energy. Understanding light output helps consumers choose the right lighting for their needs, ensuring optimal visibility and energy efficiency.