Lux is a unit of measurement used to quantify illumination. It represents the amount of light that falls on a surface area of one square meter, with one lux equivalent to one lumen per square meter. This measurement helps in assessing how well-lit a space is, which is important for various applications, including photography, architecture, and workplace safety. In practical terms, lux levels can vary significantly depending on the environment. For example, a bright sunny day can reach around 100,000 lux, while typical indoor lighting might range from 100 to 1,000 lux. Understanding lux levels is essential for ensuring adequate lighting for tasks and activities.