A Virginia Tech student has won the Greener Gadget Award for a clever LED lamp that gets all of its power from gravity, which is a seriously renewable resource. Working kind of like a grandfather clock that needs to be wound in order to work, the lamp has a weight that’s raised up every day. As the day goes on, it slowly lowers, with that movement powering the LEDs.Dubbed the Gravia, the lamp will stand about four feet tall. Encased in glass, the entire thing is lit with a soft, diffuse glow that comes from the 10 built-in LEDs. Because it’s self sufficient, there are no cables or cords to worry about, so you can place it anywhere. The best part? It’ll last for 200 years if used 8 hours a day, 365 days a year. You’ll never buy another lamp again; it doesn’t get much more green than that.