Solatube improves on the idea of using solar power for lighting, but unlike often outdated and ineffectual skylights, Solatube has the ability to light interiors not directly connected to the outdoors. That means that your dark closets, dimly lit bathrooms, windowless room, or basement apartments are capable of receiving natural light. This is accomplished by sunlight being transported through a highly reflective tube into interiors with minimal energy loss. Not only is the device eco-friendly, the dome-shaped lens is able to take in light at any time of day.
Source: solatube.comAdded: 15 March 2007