The FluoTime 200 spectrometer is a high-performance fluorescence lifetime system featuring modular construction, single photon timing sensitivity and research flexibility. It contains the complete optics and electronics for recording fluorescence decays by means of Time-Correlated Single Photon Counting (TCSPC). The system is designed for use with a femtosecond or picosecond laser system e.g. the picosecond diode lasers from PicoQuant. All monochromators are usually equipped with a stepper motor, enabling Time-Resolved Emission Spectroscopy (TRES). In TRES, the fluorescence lifetime is automatically recorded as a function of emission wavelength and allows even more detailed analysis of the decay behavior.