Light Tubes
Another type of device used is the light tube, also called a tubular daylighting device, which is placed into a roof and admits light to a focused area of the interior. These somewhat resemble recessed ceiling light fixtures. They do not allow as much heat transfer as skylights because they have less surface area.
Tubular Daylighting Devices (TDDs) use modern technology to transmit visible light through opaque walls and roofs. The tube itself is a passive component consisting of either a simple reflective interior coating or a light conducting fiber optic bundle. It is frequently capped with a transparent, roof-mounted dome 'light collector' and terminated with a diffuser assembly that admits the daylight into interior spaces and distributes the available light energy evenly (or else efficiently if the use of the lit space is reasonably fixed, and the user desired one or more 'bright-spots').
The tubular daylighting device was invented by Solatube International in 1993 and is used to provide daylighting to residential and commercial buildings, contributing to sustainability from a lighting standpoint and reducing the carbon footprint.
Read more about this topic: Daylighting
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