The photoinduced bifurcation structure in the Fe(CN)(6)(4-)-H2O2-H2SO4 system in a continuous-flow stirred tank reactor has been determined. The photo-induced transition between the low-pH steady state and the oscillatory state shows a hysteresis, similarly to the dark reaction reported previously. The action spectrum for the photoinhibition of oscillations suggests that the primary light absorber in the visible region is Fe(CN)(6)(3-), similarly to the photoinduction of oscillations reported previously, while in the UV region Fe(CN)(6)(4-) is also active. The primary photochemical processes are shown to be the following : Fe(CN)(6)(4-) + H2O reversible arrow(h upsilon) Fe(CN)(5)H2O3- + CN- and Fe(CN)(6)(3-) + H2O reversible arrow(h upsilon) Fe(CN)(5)H2O2- + CN-. The state diagram spanned by the irradiation light power and the flow rate as external control parameters is presented, on the-basis of which the mechanism of oscillations is discussed qualitatively.