This paper presents the study of the behaviour of some transparent materials, glass and plastic sheets and films, due to incidence light radiation. Transmission, reflection and absorbing coefficient variations are evaluated by experimental measurements for different incidence angles of light. To this aim two laser radiation sources have been used (a He-Ne 107S and a diode) characterised by a wavelength emission near the maximum intensity of the natural solar radiation spectrum. The comparison analysis of the experimental data acquired by linear and elliptic polarised light shows that there is no polarising effect on Lighting due to the studied materials. The lines trend obtained by the experimental data has a good agreement with the analytical lines trend, obtained by a simple theoretical model.