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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 . 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; tubulardoi:10.24018/ejers.2020.5.3.1809 fatcat:p2quos64dvdonei3pudnb4m7sq