• The sample is illuminated by a 150 W xenon (ozone-free lamp) with continuous output. • The excitation monochrometer has an optical range of 220 – 600 nm blazed at 330 nm. • The emission monochromator has an optical range of 290 – 850 nm blazed at 500 nm. • The slit widths may be continuously adjusted though the software from 0 - 30 nm bandpass. • The FluoroMax 4 has two detectors. 1. Calibrated photodiode reference detector to correct for intensity and temporal fluctuations in the source during excitation scans. 2. R928P red-sensitive PMT used in photon counting mode.