Posted by ketyung
on Feb/20/2008
at 4:46 am
Gravia Lamp is a super green LED floor lamp that makes use of gravity to generate power for it to glow for hundred years. The Gravia Lamp is the LED lamp that is completely free from electrical cable or any related structure as it needn’t be attached to any power source to shine for you.
The Gravia Lamp makes use of slow fall of a mass to spin a rotor to generate electricity to power up its 10 built-in high-output LEDs. And the lamp has a unique way of turning it on, which works more or less like any hour-glass mechanism. To turn it on, you’ll have to turn it over to move the weights from the bottom to the top of the lamp and then it’ll start its slow falling journey to generate electricity to power the LEDs up and shine the way for you.
The Gravia Lamp is a Virginia tech student’s project, who won the designer, Clay Moulton, the first place of the Greener Gadget award. It’s claimed that this lamp can be used for 200 years at 8 hours a day!
via [GadgetTastic]
Gravia Lamp,gravity-powered lamp,green gadget,greener gadget award
Technorati Tags: Gravia Lamp, gravity-powered lamp, green gadget, greener gadget award
February 20th, 2008 at 3:02 pm
Where can I buy one?
February 21st, 2008 at 5:18 am
This sounds interesting, I mean a lamp which goes on for 200 years without any power source. So the question is how can it be turned off if we don’t need it. Is there a power switch or anything, its written it uses the concept of an hour glass..
February 21st, 2008 at 6:13 am
stop the mass falling should be able to turn it off as no more power generated
February 21st, 2008 at 12:35 pm
You know what else will turn it off? The laws of physics. This thing is a poorly done perpetual motion machine. I’d call it a scam, but I think the poor designer just never paid enough attention in Phys 101. It’s sad that the people judging the contest obviously didn’t either.
February 21st, 2008 at 6:37 pm
Unless the tube is a complete vacuum or else the moving mass shall be stopped by air friction over period of time….
February 22nd, 2008 at 2:33 pm
Dave: This is not a perpetual motion machine. The weight falls for about 8 hrs, then stops when it reaches bottom. The unit is then inverted so that gravity can again power it by making the weight fall. This isn’t a “perpetual motion machine” any more than a wind-up clock is.
February 24th, 2008 at 4:39 am
[...] Source [...]
May 31st, 2008 at 7:16 am
Where can I buy one?
October 25th, 2008 at 6:28 am
For this lamp to work it requires it a person to replace the energy used by returning the weight to the start position.
About as technical as the wind-up torch.
But a good idea.
November 22nd, 2008 at 6:46 am
well, the calculated weight is somewhere around
2 tons to produce the energy similar to one single AAA
accumulator.
Verry funny to turn it around for the next night.
March 23rd, 2009 at 7:22 am
Is it available commercially for sell? I would like to import it to Africa.
November 10th, 2009 at 7:43 pm
This is embarrassing to everyone involved, especially Virginia Tech. Copyrider, what Dave means by a perpetual motion machine is in the thermodynamic sense – getting something [energy] for nothing. This machine would need something like a 25 kg (~50 lb) mass to power 10 very high intensity LEDs (each sapping about 100 milliwatts) for probably not more than about 2 minutes; the numbers are very easy to compute if you’ve taken any physics at… well, jeez, even the high school level.
This is an embarrassment and gives a bad name to scientists everywhere. This sort of bad science should be illegal.