Photo meters are commonly known as light meters, handheld devices used to measure the intensity of light in a given area. These instruments are important tools for professional photographers and videographers as they ensure accurate exposure settings are made to produce high-quality images and videos. Other synonyms for photo meters include lux meters, illuminance meters, and irradiance meters. However, these terms are slightly more specific in their application. For instance, a lux meter measures the amount of visible light in an area, while illuminance meters measure the flux of light per unit area on a surface. Regardless of the name, photo meters help photographers and videographers produce top-notch content.