Luminance measuring head, equipped with achromatically corrected, low stray light optics and high quality V(l) detector according to DIN class B. The external sighting device allows, at a working distance of 1 m, to exactly locate the measuring point, therefore, it is particularly suitable for evaluating the luminance for service and constancy tests. Three measuring channels with different sensitivity. Typical applications: Luminescent surfaces such as colour monitors, alphanumerical displays, sign plates and light panels, and reflecting surfaces, such as walls and equipment at work places, projecting screens, traffic and sign plates, guided paths and roadway lines. Measuring range: 0.04 cd/m2 to appr. 6400 cd/m2 Spectral adaptation: approxim. to photometric valuat. function V(l) for photopic vision, class B, better than 6 % Field of view diameter: approx. 30 mm at a distance of 0.5 m approx. 40 mm at a distance of 1 m approx. 120 mm at a distance of 5 m Nominal temperature: 24 °C ±2 K Operat./storage temperature: 0 to 60 °C / -10 to +80 °C Humidity range: 10 to 90 % (non-condensing) Measuring surface: 21 mm x 21 mm at 1 m operating distance Dimensions: diameter 30 mm, length 150 mm Luminance probe head with 1 ° field of view and external sighting device, DIN quality class B, with ALMEMO® connecting cable 1.5 m long, incl. factory calibration certificate calibration in cd/m2 FLA603LDM2 Technical data: Measuring range: 0.0002 lm to appr. 38 lm Accuracy: DIN quality class B Humidity range: 10 to 90 % non-condensing 11/2025 • We reserve the right to make technical changes. • High quality measuring head, DIN class B for light flux measurement with Ulbricht globe photometer. • Perfect coating of the globe with BaSO4 for diffuse reflectivity and spectrally neutral reflection quality. • Suitable for cold light sources, and lamps with high colour temperature and almost monochromatic radiation (as in LEDs). • Examples for applications: Endoscopes, fiber optic bunches, light emitting diodes. Operating temperature: max. 100 °C inside globe Inner diameter of globe: 50 mm Type Light flux probe head with ALMEMO® connecting cable 2 m long and factory calibration certificate Factory calibration KL90xx radiation for sensor, see chapter „Calibration Certificates“