The method proposed earlier by one of the authors to analyze quantitat
ively the wavelength- and intensity-dependence of the light irradiatio
n effect on chemical oscillators is critically re-examined. its applic
ation for analyzing the effect of stationary light illumination on the
Belousov-Zhabotinsky and related minimal-oscillator systems is discus
sed in detail to explore the primary photochemical process and subsequ
ent reactions of the key intermediates responsible for the photo-respo
nse. Some hints are given for possible future developments for the pho
to-control of chemical oscillators together with a description of prel
iminary results of experiments being under way in our laboratory.