A light tube is not intended for imaging (in contrast to a periscope, for example) thus image distortions pose no problem and are in many ways encouraged due to the reduction of "directional" light. Other daylighting products are on the market under various generic names, such as "SunScope", "solar pipe", "light pipe", "light tube", and "tubular skylight".Ī tube lined with highly reflective material leads the light rays through a building, starting from an entrance-point located on its roof or one of its outer walls. This system has been marketed for widespread residential and commercial use. The concept was rediscovered and patented in 1986 by Solatube International of Australia. Chappuis Ltd's reflectors were in continuous production until the factory was destroyed in 1943. The first commercial reflector systems were patented and marketed in the 1850s by Paul Emile Chappuis in London, utilizing various forms of angled mirror designs. Bends in the pipe have little effect on efficiency. Hexagonal pipes tend to produce the most homogenized type of IR Light. Square and hexagonal cross-sections are used in special applications. While most light pipes are produced with a round cross-section, light pipes are not limited to this geometry. This is done to limit IR light to only certain areas of the pipe. Carbon black can be applied to certain parts of light pipes to absorb IR light (see photonics). This is because these are tubes lined with a highly polished infrared reflective coating of gold, which can be applied thick enough to permit these tubes to be used in highly corrosive atmospheres. Manufacturing custom designed infrared light pipes, hollow waveguides and homogenizers is non-trivial. Types The Copper Box, venue for Handball at the 2012 Summer Olympics, makes use of light tubes to reduce energy use. Principles of nonimaging optics govern the flow of light through them. They can be divided into two broad categories: hollow structures that contain the light with reflective surfaces and transparent solids that contain the light by total internal reflection. In their application to daylighting, they are also often called tubular daylighting devices, sun pipes, sun scopes, or daylight pipes. Light tubes (also known as solar pipes, tubular skylights or sun tunnels ) are structures that transmit or distribute natural or artificial light for the purpose of illumination and are examples of optical waveguides. Total external reflection, hollow light tube Total internal reflection, block of acrylic For other uses of the phrase "light tubes", see Light tube (disambiguation).
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