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T.D.G.S., “Tubular Daylight Guidance Systems”, are natural lighting processes based on the transport of light. In 1990, they were judged by Littlefair as the most innovative technology in daylighting [1]. From 1982 to 2020, this paper is a state of the art on the different processes of tubular daylight guide systems. The key words used to carry out the census are light pipe; light tube; light guide; sun pipes; solar pipes; solar light pipes; daylight pipes; tubular skylight; sun scoop; tubular daylighting device; tubular daylight guide systems; mirrored light pipe. A classification by type of process is proposed (collection, transport or diffusion) for each technology identified in the literature.

Abstract-Daylight offers many possibilities. Its proper use is a major asset to develop the design, energy and environmental quality of a building but also improve the physiological and psychological conditions of the user. New emerging devices, offer the opportunity to improve visual comfort while, providing energy savings. The light pipes are considered as a part of these innovative devices. Existing semi-empirical models do not adequately transcribe the behavior of light pipes. The scientific objective of this study is to investigate the propagation of light within a real test-cell equipped with this device in real weather conditions. The aim is to better understand the role of each parameter (solar geometry, diffuse illumination, direct illumination, etc.). The results indicated a difference in light distribution within the test cell between the clear and overcast sky. We target new parameters to take into account in modeling the phenomenon.Index Terms-Light pipe MLP, Hemera, daylighting analysis, experimental measurement.

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