Photometers/Radiometers
BS EN ISO 3059: Lighting conditions are quoted on the test surface.
BS EN ISO 9934-3 states the minimum UV-A irradiance is measured at a distance of 400mm from light source to the radiometer.
Digital Radiometer/Photometer
BS EN ISO 3059: Lighting conditions are quoted on the test surface.
BS EN ISO 9934-3 states the minimum UV-A irradiance is measured at a distance of 400mm from light source to the radiometer.