PhotonBoy
Flashlight Enthusiast
http://sparkingtech.com/tech-sci-news/gravia-gravity-lamp-lasts-200-years-doesnt-have-power-cord/
"The Gravia, as it is called, has 10 LEDs and is powered by a weight which is manually raised once a day and slowly falls to the bottom as the day progresses. There is no power cord in sight. The entire column, measuring just over 4 feet high, gets a soft, diffuse glow as a result."
Flickr photo:
http://www.flickr.com/photos/inhabitat/2245958810/
"The Gravia, as it is called, has 10 LEDs and is powered by a weight which is manually raised once a day and slowly falls to the bottom as the day progresses. There is no power cord in sight. The entire column, measuring just over 4 feet high, gets a soft, diffuse glow as a result."
Flickr photo:
http://www.flickr.com/photos/inhabitat/2245958810/