ISD-5-VL Luminous Flux Detector
(Formerly Model LSM-9901)

The ISD-5-VL luminous flux detector is set-up with a compact 50mm diameter barium sulfate coated integrating sphere with 12.5mm measurement port and a photodiode detector with precise photometric correction filter. It’s V(λ) spectral sensitivity matches the DIN CIE standard to equal or better than 5% for DIN Class B specification. The integrating sphere supports the measurement of directional light sources, e.g. cold light sources with light guide and other narrow beam sources. The detector is supplied with a 2m long coaxial cable with selectable –1, -2 or -4 type connector for use with Gigahertz-Optik’s range of optometers. Calibration of luminous flux lm is performed at Gigahertz-Optik’s Calibration Laboratory for Optical Radiation Quantities.