Zahner’s CIMPS is a highly dynamic LED-based system with an active light feedback loop that ensures a controlled and constant light intensity during the photoelectrochemical or photovoltaic measurements. Fast light sources enable dynamic photoelectrochemical measurements like IMPS/IMVS. The robust control of light intensity allows accurate IMPS/IMVS measurements, giving the system its iconic name “controlled intensity-modulated photo spectroscopy (CIMPS)”. Further information on our light feedback loop and its benefits is provided in the manuscript “C in CIMPS“. Besides standard electrochemical measurements, a list of the standard photoelectrochemical or photovoltaic measurements is provided below