Light measurement refers to the process of quantifying the intensity, quality, and distribution of light. This is typically done using instruments like photometers and spectrometers, which can measure various aspects of light, such as brightness and color. Accurate light measurement is essential in fields like photography, agriculture, and environmental science, where understanding light conditions can significantly impact outcomes. Different units are used for light measurement, including lumens for total light output and lux for illuminance, which measures how much light reaches a surface. Additionally, color temperature is measured in Kelvins, indicating the warmth or coolness of light. These measurements help in designing lighting systems and ensuring optimal conditions for various applications.