Gravity Lamp, the LED lamp powered by gravity Answered
A Virginia Tech student designed an LED lamp that is powered by gravity. It is called the Gravia, and it took second place at the Greener Gadgets competition in NYC. Gravity as a renewable energy source? Amazing!
Concept illustrations of Gravia depict an acrylic column a little over four feet high. The entire column glows when activated. The electricity is generated by the slow fall of a mass that spins a rotor. The resulting energy powers 10 high-output LEDs that fire into the acrylic lens, creating a diffuse light. The operation is silent and the housing is elegant and cord free Ã¢â¬â€ completely independent of electrical infrastructure.
The light output will be 600-800 lumens Ã¢â¬â€ roughly equal to a 40 watt incandescent bulb. Each drop of the gravity mechanism runs the light over a period of four hours.
To "turn on" the lamp, the user moves weights from the bottom to the top of the lamp. An hour-glass like mechanism is turned over and the weights are placed in the mass sled near the top of the lamp. The sled begins its gently glide back down and, within a few seconds, the LEDs come on and light the lamp, Moulton said. Ã¢â¬ÂItÃ¢â¬â¢s more complicated than flipping a switch but can be an acceptable, even enjoyable routine, like winding a beautiful clock or making good coffee,Ã¢â¬Â he said.
Moulton estimates that GraviaÃ¢â¬â¢s mechanisms will last more than 200 years, if used eight hours a day, 365 days a year.
The winner of the Greener Gadgets competition was the Enerjar.