Light pipe technologies

In illumination engineering, it is often desirable to transport light from a source and to distribute it in a particular area. Optical fibres can be used effectively to guide light for small-scale applications. But, optical fibres are unsuitable for large-scale lighting applications since both the cost and the mass of a large solid-core fibre are prohibitive. For these reasons, hollow light guides are preferred in these cases. Our light guide research has primarily focused on the prism light guides, hollow structures that pipe light by means of total internal reflection (TIR), and can achieve high efficiency and uniform illumination. Prism light guides have been widely used around the world, primarily in applications where it is desirable to separate the source from the region being illuminated. Common installations include tunnel lighting, industrial spaces such as warehouses, high ceiling areas, and architectural highlights on buildings.