A shadowy space changes its atmosphere dramatically when it is suddenly illuminated by natural sunlight. Who has experienced this effect will never forget the impression. In the past years architects have applied complex daylighting-sytems to counteract the lack of light in the lower floores of large buildings. Still a cheap and efficient device that brings sunlight to individual living and working areas does not exist. The principal idea of the helioflex-concept was to create an automatic device, that could be inserted to the existing architecture and that would permanently reflect direct sunlight to a chosen point. The device has to be cheap enough for the people living in dark homes to afford it. It has to be of a simple and enduring construction, individually applicable and supplying its own power.

The presented prototype is provided by a light-sensitive sensor to trace the position of the sun. A simple mechanism transmitts the movement of the sensor and simultaneously adjusts the mirror-position just the right angle to keep the reflecting sunlight on the spot once selected. The construction and the set-up of the device´s support is equal to that of individual satellite-dishes used around the world. As a mass product, the sunlight-reflector can be sold at a fairly low price. Undoubtebly there is a need for the device. If you take the city of Berlin alone, cautiously estimated 150 000 potential customers are waiting in their dark homes for the sun to rise.


Specifications of the Prototype

Mirror size: 85cm Ø

Mirror material: Plexiglass-mirror with mirrored backings

Construction: Satellite-dish 85cm Ø

Wind resistance: 120 km/h (frame)

Motor: DC satellite-rotor (max. 20 W)

Tracking-system: Transistor-switch,patented helioflex-tracking-system

Power-supply: 20 V solar-panel (30x30 cm)




© christoph keller, helioflex, fehrbelliner str. 81, d-10119 berlin