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The photoinduced discharge characteristics of cadmium sulfide‐Lucite binder layers with a CdS powder weight concentration of 89% have been studied as a function of the initial potential, layer thickness, and light intensity over the wavelength range 3800 to 6800 Å. The results are well described by the capacitor discharge model previously presented by Li and Regensburger with only a slight extension necessitated by light penetration into the bulk of the layer; this penetration is caused by light scattering due to the particulate nature of the layer. On the basis of this model, the electron trapping range was determined to be 4.5±1×10-7 cm2/V, a result independently confirmed by a light pulse technique. The quantum efficiency for the photoexcitation of carrier pairs was estimated as unity for all wavelengths studied.