WEILHEIM AN DER TECK, Germany, Nov. 14, 2014 — The GL Opti Light LED 127 from GL Optic is an integrating-sphere-based uniform source that offers a comprehensive test system in a compact size. The device uses a patented, multilevel procedure that calibrates every LED light source and stores the spectral properties in the unit’s electronic controls. Closed-loop calibration is possible through a high-accuracy photodiode. An electronic control system and thermal stabilization achieve colorimetric stabilization. The GL Opti Light LED 127 can be used as a calibration reference for cameras and other optical instruments, in addition to being a reference light source for laboratory applications.