EFFECT OF LIGHTING CONDITIONS ON VISUAL TRANSPARENCY OF GLASS FIBER FABRICS AS A FUNCTION OF YARN DIAMETER AND POROSITY

We verified the validity of using woven glass fabrics as ceiling materials by conducting experiments where participants performed visual target detections behind the glass fiber ceiling and evaluated the target appearance under various conditions. We found that occupants cannot detect the visual target through the glass fabric ceiling with a porosity of 30% if the ceiling is illuminated as high as 1000lx and that the higher the porosity, the higher the target illuminance, and the lower the ceiling illuminance, the more annoying the target appears. Finally, we proposed a design tool to determine appropriate lighting for the glass fabric ceiling.