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GravityLight - bag - 01.jpg

GravityLight is a gravity-powered lamp designed by the company Deciwatt for use in developing or third-world nations, as a replacement for kerosene lamps. It uses a bag filled with rocks or earth, attached to a cord, which slowly descends similar to the weight drive in a cuckoo clock. This action powers the light for up to thirty minutes.[1][2][3][4][5][6]

Funding and development[edit]

The IndieGoGo campaign of GravityLight was ended on January 15, 2013 with $399,590 funded by 6219 funders.[7]

Martin Riddiford and Jim Reeves worked on GravityLight as a side project for four years.[8]


There are no operating costs after the initial purchase of the appliance. A standard GravityLight kit comes with an adjustable lamp and a ballast bag. The light can be turned on by filling the bag with approximately 20 pounds weight[9] and lifting it up to the base of the device; the weight falls over a period of 25 minutes, pulling a strap that spins gears and drives a motor, which continuously powers an LED.[10] This creates enough energy to last 25 minutes whenever it is needed. The lamp can be recharged by solar panel.[8]

In the media[edit]

GravityLight was called one of The 25 Best Inventions of the Year 2013 by Time Magazine.[11]

Further reading[edit]


  1. ^ "Help make it happen for GravityLight, lighting for the developing countries". Retrieved 2012-12-22. 
  2. ^ "GravityLight: gravity lighting without battery". Retrieved 2012-12-22. 
  3. ^ Divulgação. "Nova lâmpada é movida a gravidade -". Retrieved 2012-12-22. 
  4. ^ "Soon, lamps powered by gravity - The Times of India". The Times of India. Retrieved 2012-12-22. 
  5. ^ "Schwerkraft-Lampe Gravity Light, Android-Konsole Esfere - SPIEGEL ONLINE". 2012-12-13. Retrieved 2012-12-22. 
  6. ^ Warr, Philippa (2012-12-18). "Innovative £3 light powered by sand and gravity". Retrieved 2013-01-02. 
  7. ^ "GravityLight: lighting for developing countries". Indiegogo. Retrieved 16 February 2014. 
  8. ^ a b Joann Pan (2012-11-28). "This $5 Lamp Is Powered Solely by Gravity". Retrieved 2012-12-22. 
  9. ^ "A $5 Lamp Can Change The World - GravityLight". Forbes. Retrieved 16 February 2014. 
  10. ^ "Deciwatt GravityLight". PopSci. Retrieved 16 February 2014. 
  11. ^ "The 25 Best Inventions of the Year 2013". Time Magazine. Retrieved 16 February 2014. 

External links[edit]