Self Powered LED Lamp LEDs are quickly becoming the future of
lighting. The Gravia combines LEDs and gravity induced power to
form a completely self-powered and efficient lamp. The lamps
autonomous glow is achieved from a slow falling rotator. As it
drops it spins generating energy. Light output is 600 – 800
lumens – the equivalent to a 40-watt incandescent light bulb
burning over 4 hours. The Gravia’s life span is 200 years if
used 8 hours a day for 365 days a year. More info here.