A set of glasses with geometrical obstruction, not commercial at the moment, was characterized to evaluate the luminous performance and the influence on the visual comfort for users. Obstructions and decor have different geometries and colours and reduce both the light transmittance and the view through the glazing.

The demand of decorated glass increases and the market provides multiple choices as concerns both, the production technologies (silk screen printing, acid etching, etc.) and the type of decorations (geometrical patterns, colours, shapes and drawings, etc.).

The glazing components characterized in this work are laminated glass panes (safety products) 30 x 30 cm2 in size. The decors seen in figure 1 are sublimated on a plastic interlayer and laminated between two glass panes (3 mm float glass).

This innovative system preserves the decor from aging and scratching and allows to use this decorated glass in applications usually avoided in the case of single glass panes. This particular safety glass can be used to decorate the facades of buildings, partition elements in public rooms, or shop windows and doors; it can be also utilized in interior design such as shower boxes, stairs, parapets, shelves, and so on.

The decor design has really no limits, since the technology adopted allows to print on glass every type of pattern and picture (i. e. points, lines, rainbows, water effect, rock effect, photographs, etc.).

The three samples analyzed in this work features only geometric patterns (with different shapes, colors and dimensions) due to the difficulty to determine the visual properties of the artistic decors. Sample number 12, figure 1 on the left, has rectangular black obstruction on clear glass. The dimensions of the rectangles vary with the same pitch on the x and y axis. Sample number 13, on the right, has rectangular white obstructions on clear glass, but the texture varies along the two axis. Sample number 6, across the other samples in the picture, is the only sample with color. Its decor looks like a random distribution of blue rain drops on the clear glass.