GravityLight: the low-cost lamp powered by sand and gravity | Design | The Guardian
Deciwatt GravityLight | Engineering For Change
GravityLight: A New And Safer Way To Light Up Rural Africa | Evolving Science
Erudition Hub - Gracity Light: 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
Стартаперы разработали лампу, работающую за счет гравитации | Техкульт