COMPARISON OF COLORIMETRIC FEATURES OF SOME CURRENT LIGHTING BOOTHS FOR OBTAINING A RIGHT VISUAL AND INSTRUMENTAL CORRELATION FOR GONIO-APPARENT COATINGS AND PLASTIC

摘要

In this work we did a colorimetric and photometric analysis of new two lighting booths, with directional illumination, and comparing them with a conventional lighting booth with diffuse illumination. The colorimetric analysis shows that the first one (byko-spectra effect) uses light sources very different from the D65 illuminant, thus the visual and instrumental correlation cannot be right when at instrumental level the D65 illuminant is continuously used as reference. In contrast, the second one (gonio-vision-box) uses one light source closer to the D65 illuminant, but with a medium level of color rendering. The photometric analysis in both cabinets shows the corresponding illuminance fields are not homogenous, although the average illuminance values are right according to the technical recommendations for visual assessments. Consequently, many improvements could be done in both types of directional illumination cabinets for increasing the high quality control protocols about colour & texture for gonio-apparent materials in the automotive sector.