page_title: Light tube
hierarchical_section_title: Light tube
context_page_description: Light tubes are physical structures used for transmitting or distributing natural or artificial light for the purpose of illumination, and are examples of optical waveguides.
  In their application to daylighting, they are also often called tubular daylighting devices, sun pipes, sun scopes, or daylight pipes. Light pipes may 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. The principles governing the flow of light through these devices are those of nonimaging optics.
context_section_description: Light tubes (also known as light pipes or tubular skylights) are physical structures used for transmitting or distributing natural or artificial light for the purpose of illumination, and are examples of optical waveguides.
  In their application to daylighting, they are also often called tubular daylighting devices, sun pipes, sun scopes, or daylight pipes. Light pipes may 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. The principles governing the flow of light through these devices are those of nonimaging optics.
caption: Total external reflection, hollow light tube