The times of using expensive, bulky, power thirsty, and inefficient incandescent, arc and discharge lamps together with mechanical choppers for optical spectroscopy are gone! Pulsed LED illuminator SSSOT-LED-I(C1x0-S0x-xxx) (former SSSOT-002X)replaces them all! It consists of controller, and the light source. The frecuency of light flashes is is variable (from 0 up to 10 kHz). The beam is focused in a spot of 3-mm size. The intensity is variable from 0 to 100 mW/sq.cm. "TRIG" output can be used to synchronize a detection equipment (lock-in amplifier). Standard light source emitts in a band of 30 nm around the 455-nm peak (Royal Blue).