Biotic Shading for Better Light Environment

Tropical climates with partially cloudy skies are characterized by high luminance on the glass façades of high-rise buildings, which is a significant challenge as it causes glare and eyestrain among workers. As urban green spaces continue to decline and sustainable development becomes increasingly urgent, architects have responded by designing vertical buildings with vegetation integrated into façades. Therefore, this study aimed to develop an implementation strategy for glare mitigation using a biotic façade to enhance visual comfort for office workers in high-rise buildings. An experimental method was adopted using a controlled cubical office space outfitted with vegetation as shading, specifically Vernonia elliptica, applied in two foliage densities represented by Leaf Area Index (LAI) values. These conditions were then compared to a baseline façade without vegetation. The results indicated that LAI 1,5 offered sufficient illuminance (Daylight Factor/DF of 6,2%), reduced glass luminance by up to 56,1%, achieved a Daylight Glare Index (DGI) of 21,67, and led to Glare Sensation Vote (GSV) ratings “perceptible”. This study affirmed that biotic façades offered distinct advantages as glare mitigation devices. Foliage density could also be adjusted according to daylight needs while enhancing Interest Value (IV) through green leaf coloration, foliage patterns and its movement, where the benefits were not found in artificial solutions.