LTS-300 is used to test the LEDs at stable state and instantaneous state. LTS300 can provide pulse power and trigger signal, working in with HAAS series High Accuracy Array Spectroradiometer which developed by EVERFINE, The instrument has built-in program-controlled constant current source and constant voltage source, and the forward current IF, forward voltage VF, reverse current IR and reverse voltage VF of LEDs can be measured.