The influence of light illumination on the dielectric properties of <$Eroman {PbMoO sub 4 }> crystals is studied. The increase of the permittivity under illumination is revealed. The optical excitation spectrum of the permittivity is practically the same as that of thefluorescence and photoconductivity. The results for dependences of this "photo-dielectric effect" (p.d.e.) on the temperature, the frequency of measuring electric field, the samples thickness and the light intensity are presented. They show a close relation of the p.d.e. to the point defects of crystalline lattice. A possible mechanism for the p.d.e. is suggested.

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