This is one of the coolest gadgets ever made, Gravia - the gravity lamp. A student in Virginia won the Greener Gadget Award for his LED lamp that works on the gravity. The lamp has a weight that needs to be raised everyday; the weight is connected to a rotor by a cord. The electricity is generated by the slow fall of a weight that spins the rotor and powering 10 LEDs inside the acrylic column, which sets whole acrylic lens on fire. The light output will be around 600-800 lumen almost equal to a 40 watt bulb.
As Gravia lamp works on it’s on, so there are no cables on the outside, which makes it clutter free and you can easily place it anywhere. Unbelievably, the lamp can be used for 200 years, if used 8 hours a day, 365 days a year. You will never buy another lamp again; it does not get much greener than that.
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