Sunlight is the standard for lighting. It's what our eyes are adapted to, it's absolutely free, and it is the light we are most comfortable with. Inside buildings, we've gotten used to having artificial lighting, but spaces with daylight are always nicer.
A range of companies are now producing systems for capturing sunlight and transmitting it into the interior of a building with fiber optic cables, where it is used to illuminate spaces that cannot benefit from direct daylighting through windows. Today we feature three companies with fundamentally similar systems. Each uses a rooftop collector (though each has its own approach for this) to gather sunlight and a fiber optic cable bundle to carry the light into the building.
Read the entire article here at Ecogeek.org