BLACKSBURG, Va., February 19, 2008 -- A Virginia Tech student has created a floor lamp powered by gravity.
Clay Moulton of Springfield, Va., who received his master of science degree in architecture (concentration in industrial design) from the College of Architecture and Urban Studies in 2007, created the lamp when he was an industrial design graduate student. The light-emitting diode (LED) lamp, named Gravia, has just won second place in the Greener Gadgets Design Competition as part of the Greener Gadgets Conference in New York City.
Concept illustrations of Gravia depict an acrylic column a little over four feet high. The entire column glows when activated. The electricity is generated by the slow fall of a mass that spins a rotor. The resulting energy powers 10 high-output LEDs that fire into the acrylic lens, creating a diffuse light. The operation is silent and the housing is elegant and cord free -- completely independent of electrical infrastructure.
The light output will be 600-800 lumens - roughly equal to a 40-watt incandescent bulb over a period of four hours.
To "turn on" the lamp, the user moves weights from the bottom to the top of the lamp. An hour glass-like mechanism is turned over and the weights are placed in the mass sled near the top of the lamp. The sled begins its gentle glide back down and, within a few seconds, the LEDs come on and light the lamp, Moulton said. "It's more complicated than flipping a switch but can be an acceptable, even enjoyable routine, like winding a beautiful clock or making good coffee," he said.
Moulton estimates that Gravia's mechanisms will last more than 200 years, if used eight hours a day, 365 days a year. "The LEDs, which are generally considered long-life devices, become short-life components in comparison to the drive mechanisms," he said.
The acrylic lens will be altered by time in an attractive fashion, Moulton said. "The LEDs produce a slightly unnatural blue-ish light. As the acrylic ages, it becomes slightly yellowed and crazed through exposure to ultraviolet light," he said. "The yellowing and crazing will tend to mitigate the unnatural blue hue of the LED light. Thus, Gravia will produce a more natural color of light with age."
He predicted that the acrylic will begin to yellow within 10 to 15 years when Gravia is used in a home's interior room.
A patent is pending on the Gravia. To learn more, contact Jackie Reed of Virginia Tech Intellectual Properties Inc. (http://www.vtip.org) at firstname.lastname@example.org or call (540) 443-9217.
Sigh. I always seem to be the one on the alternative energy forums taking the wind out of people's sails. Sorry everybody (especially Kelda), but the gravity lamp can't work the way the inventor claims. It's founded on faulty math.
I'm as disappointed as everyone else - I excitedly covered the gravity lamp on my blog a few weeks back, but as a result, I've also tracked the aftermath of the announcement.
Basically, the math involved in the gravity lamp is just wrong. In summary:
[li]In the schematics, the weight is defined as 50 pounds. Let's ignore for the moment the fact that 50 pounds is too heavy for most humans to reasonably lift.[/li] [li]Next, 50 pounds falling 1.22m in gravity of 9.8m/s2 gives you 271.4 joules.[/li] [li]If you ignore energy losses, which are probably going to be considerable, 271.4 joules can power a 1 watt light for four and a half minutes.[/li] [li]If you reduced the bulb to a little .1 Watt LED, like a Christmas light, you could get 45 minutes of light out of it.[/li]
Since his math was incorrect, the inventor has announced a statement of apology.
I still think it's wonderful to look for devices like this that take advantage of unconventional energy sources. Personally, I've transformed my tv remote control so that it's powered by shaking. All of my flashlights are wind-ups, and our elliptical machine is hooked up to power the tv we watch when we're exercising. So I hope we find more cool stuff like this that actually pans out...
Brave New Leaf - Everyman Environmentalism http://www.bravenewleaf.com
Opportunity is missed by most people because it is dressed in overalls and looks like work - Edison. Tiny ad: