Gigahertz-Optik’s new TP121-TH measuring system for testing and binning of back-end LEDs, is a high-quality LED testing system that supports a fully automated testing process. The system’s design conforms to the latest norms and regulations (such as CIE S025, LM-79-08, DIN 5032 Part 9). It comprises five main function groups (1) Light meter for the luminous flux, spectrum, color, and color rendering index, (2) Thermoelectric LED attachment for electrical contact, heating, and cooling, (3) Supply and measurement electronic system for pulsed and constant current modes, (4) Software for fully-automated measurement sequences with conclusive light evaluation, and (5) Light-tight housing.