This is a very interesting new development. Since the arrival of affordable LEDs and their increasingly better efficiency and light quality new mechanisms can be used to power these new lights in any dwelling.
British designers Martin Riddiford and Jim Reeves of GravityLight use just this–gravity with a sand filled bag or other wights to power the lamp. The lamp also serves as a power station to power radios or other low-wattage devices.
See for yourself and watch the video at SmartPlanet: How a $5 gravity-powered LED could revolutionize cheap lighting | SmartPlanet.
- Duo create GravityLight: Lamp that runs off of gravity (w/ video) (phys.org)
- Lights Powered by Gravity Brighten Rural Areas (treehugger.com)
- GravityLight is a Cheap, Green Weight-Powered Alternative To Solar Lamps (inhabitat.com)
- A $5 LED Lamp Powered By Sand And Gravity (fastcodesign.com)
- New Frontiers in Free Energy: The Gravity Light (wakingtimes.com)
- Innovative £3 light powered by sand and gravity (wired.co.uk)
- Gravity powered lights, cheaper than solar (boingboing.net)
- Powered By Gravity (andrewsullivan.thedailybeast.com)