Performance of light redirection systems in model buildings under typical sky and building obstruction conditions encountered in Hong Kong

In Hong Kong, many buildings are high-rise blocks constructed close to each other resulting in severe sky obstructions, more particularly for rooms at the lower floors. Innovative daylighting technologies that transport natural light from outside towards the inner part of deep plan rooms are appropriate devices to improve daylight uniformity and visual comfort. Good visual effects and less lighting energy use may result if proper designs are employed. This paper studies the performance of light redirection systems via scale model under real sky conditions. The results demonstrate that laser cut panels can generally increase the interior daylight in the rear of the scale model room, improve the daylight uniformity and have the potential to reduce the electric lighting energy use.