The micro-light guiding shade is a device that acts to both shade the facade from direct sunlight and distribute daylight deep into sub-tropical buildings. The device was created in response to the need for daylighting technologies that can utilise direct sunlight while maintaining visual and thermal comfort in sub-tropical buildings. The created device has the form of a fixed panel with similar thickness and outward appearance as existing shades, yet performs the dual purposes of shading and light redirection. Experiments and computer lighting simulations were performed to assess the device's performance in terms of effectiveness, efficiency, implementation, cost and construction issues. Experimental results show that the device provides favourable illumination deep within a room, while reducing glare for room occupants. Computer simulations compare favourably with experimental measurements, and have been used to find the optimal configuration of the panels in various situations. Installation of the device on high rise commercial buildings will reduce reliance on artificial lighting while improving the visual performance of office workers. (C) 2003 Elsevier Ltd. All rights reserved.