Related Sections: Green Tech Household
'Gravity Lamp' lasts 200 years, never needs to be plugged in
A Virginia Tech student has won the Greener Gadget Award for a clever LED lamp that gets all of its power from gravity, which is a seriously renewable resource. Working kind of like a grandfather clock that needs to be wound in order to work, the lamp has a weight that's raised up every day. As the day goes on, it slowly lowers, with that movement powering the LEDs.
Dubbed the Gravia, the lamp will stand about four feet tall. Encased in glass, the entire thing is lit with a soft, diffuse glow that comes from the 10 built-in LEDs. Because it's self sufficient, there are no cables or cords to worry about, so you can place it anywhere. The best part? It'll last for 200 years if used 8 hours a day, 365 days a year. You'll never buy another lamp again; it doesn't get much more green than that.
Greener Gadgets, via Sawf
By rossgrady at 10:27 AM ON 02/19/08
Not to pick nits, but wouldn't it be more accurate to say that the thing gets all its power from whatever you ate for breakfast, since you're the one bending over to hoist the weight back up to the top of the thing? My vague recollection of high school physics would indicate that we're talking about a closed-loop conversion of kinetic to potential (back to kinetic, thus to light + heat) energy here.
By bill.lehecka at 12:50 PM ON 02/19/08
Sounds like ross' breakfast consisted of some urine flavored cheerios.
By dinoroger at 1:30 PM ON 02/19/08
So couldnt this thing have 2 weights? One to power the light and one to store up enough energy to reset the device at the end of the day. This way nothing needs to be done with it ever.
By Perkowski at 1:45 PM ON 02/19/08
How much? Incredible potential! How do I invest?
By A CLUE at 2:10 PM ON 02/19/08
DinoRoger . . . do you have to wear a helmet when you use the internet?
Why couldn't it have ten weights, and be a limitless supply of free energy? We could hook the whole grid up to it!
By Wingnut at 5:04 PM ON 02/19/08
Urine Flavoured Cheerios! Now THATS energy efficiency!
By Wyle_E at 7:23 PM ON 02/19/08
The generator and ratchet mechanism are going to last 200 years? Grandfather clocks can run continuously for decades because they get wound once a week, and draw only a few milliwatts.
By murray at 12:56 AM ON 02/20/08
Props to the inventor. However, as Wyle_E mentions, there is no way the mechanism will last 200 years, even if the LEDs do. If it's built like a first-rate swiss watch, it might last decades. And as RossGrady said, it actually gets its power from the person who lifts the weight each day. And DinoRoger, please go read some physics 101 books.
By Kage at 3:18 AM ON 02/20/08
Well, Rossgrady, if we are going to be pedantic, I'll go one better and say that it DOES get its power from gravity, because if it weren't for gravity the owner wouldn't HAVE TO lift the weight every day, and it wouldn't fall every day. In fact it wouldn't even work, or even exist.
By BG at 9:30 AM ON 02/20/08
to be even more pedantic kage, gravity is what converts the potential energy in the weight to kinetic energy. the potential energy is supplied to the weight by the person who is turn got their energy from their food. gravity is a transducer here. it doesn't supply any energy
By hoosier daddy at 10:21 AM ON 02/20/08
to not be pendantic, i like it. i'd buy it. i'd use it. i wouldn't argue about it.
By Ridiculous at 1:01 PM ON 02/20/08
Has anyone done the math on this? I don't know what is more ridiculous, this idea or the fact that it won first prize. I would not enjoy lifting a 3,200 pound weight every 4 hours to power ten measly LEDS. Conservatively assuming the 10 LEDS pull 1 watt of power for 4 hours (14400 secs), we need 14400 joules of energy. If the magical lamp was 100% efficient we would need to lift 1469.39 kg one meter to supply the energy for 4 hours = Ridiculous.
By murray at 2:18 PM ON 02/20/08
Hey Ridiculous, I think you might want to re-do your equations. Just looking at the picture, I'm guessing the weight is about 5 - 10 pounds.
By designWithIntegrity at 6:02 PM ON 02/20/08
The conference organizers must feel pretty silly giving an award to such a bogus bit of design. 50 lbs (5x10-lb brass weights, read the picture) raised 60″ in Earth’s gravity gives a total energy of 346 Joules, or .025 Watt over 4 hours (that’s 0.1 W-hr). The best LEDs available today produce 200 lumens / Watt. In short, Clay’s Moulton’s Gravia will run for about 1 minute, not 4 hours. It's also one of the core bits of his Master's thesis, so his Graduate Committee should also feel pretty dumb for missing an error of this magnitude (2 to 3 orders, to be exact).
By Electronate at 11:23 AM ON 02/21/08
...Soon the gravity gun from HL2... Soon.
By ritsak at 4:41 PM ON 02/21/08
Why do you all have to assume you're right? Can't you assume it would work, and try to figure out how, instead of putting the guy down? I think it sounds like a quite plausible idea, depending on how bright you want your light.
By ritsak at 4:44 PM ON 02/21/08
Why do you all have to assume that he doesn't have a plausible idea? Can't you assume it would work and try to figure out how, instead of putting the guy down bc you didn't win any awards? I think it's quite a plausible idea, depending on how much light you want. (even though I detest tree-huggers, your attitudes are disgusting)
By ritsak at 4:46 PM ON 02/21/08
oops... I guess I wasn't patient enough.
"(Please be patient, it may take a moment for your comment to appear.)"
By Matt at 9:07 PM ON 02/22/08
Ritsak, they just did some simple physics to calculate precisely how much energy you can extract from the gravitational potential of that weight lifted that distance, and hence how much light you can get out of it.
If the inventor managed to beat the laws of physics, he'd have something a lot more exciting than en economic lamp to show for it...
Maybe he has some hyper-efficient LEDs, or some part of that calculation that I'm too lazy to check was actually wrong (you'd assume the guy would do such calculations) so I'm happy to be proven wrong, but don't jump on them for being skeptical - without skeptics we'd be trying to get cheap energy by imploring the Sun God to shine harder.
By zombie at 1:28 PM ON 02/23/08
Hey, Ritsak. I have an investment opportunity for you. You will make millions of dollars, guaranteed. Please send me $1000 and I will give you this amazing secret.
Oh, and please don't engage your logic, that would be a disgusting attitude. Just assume this will work.
By Harvey at 8:24 PM ON 02/23/08
I'm sure it will last 200 years. I have a device that works on the same principle--it's a pendulum clock. I crank up the weights once a week and it keeps time 24x7. It is over 200 years old.
If 18th century technology can last 200 years, I think 21st century technology has a good shot
By Perceptor at 8:52 PM ON 02/23/08
I'm not going to pretend to know what calculations are needed to develop a device that polarizes a forum with such polarity but what if the inventor figured out some way to create more resistance for the weight, generating more kinetic energy? Just a thought. Or maybe the weight houses a colony of "space worms". You know, those little critters that eat air and produce enough energy in their waste to power starships. Not only would the "space worms" create a renewable source of energy but also a renewable source of amusement. Those silly "space worms". They crack me up.
By offline at 10:05 PM ON 02/23/08
Check it. http://www.core77.com/competitions/greenergadgets/projects/4306/greener_gadgets_03.jpg
Two seconds on google yielded more details and this nice schematic that explains the mechanics of the machine in a way that I think even Dinoroger.. alright, maybe not. But for the rest of you.
By somebot at 8:23 AM ON 02/24/08
@ROSSGRADY: Thank you! I came here to say the same thing; power required for this device isn't just gravity; it's "powered" by the force that sets the potential energy of the weight back into position to become kinetic energy. Maybe that's why this article is at "SciFi" instead for "PopSci" or "SciAm"...
By grambo517 at 3:40 PM ON 02/24/08
Yea probably the same amount of energy it takes for your fat azz to either put down the whopper and get off the couch to flick the light switch or move your gigantic fat arms fast enough to clap twice for your clapper.
By puttputt at 7:36 PM ON 02/25/08
IF MADE IN CHINA IT WILL LAST A YEAR BUT THIS IS GOOD FOR THE PROFIT MARGIN.
PUTTPUTT JUDGES THIS A HIT.
By nicad at 4:51 AM ON 02/27/08
Just a laymans thought... having looked at the web page with the diagram, why bother including a recitfyer when you could wire up the LEDs like a full wave rectifier and let them do it themselves while giving out light? Other than that, seems like a good idea if you live off grid and can still afford it... I have several wind up torches that I keep in my cars.. At least the torches are green! (ish) :-)
By nicad at 4:56 AM ON 02/27/08
One other thought... it's bloody ugly! When will people start making things with a bit of taste again like they used to a hundred hears ago? My house is full of antiques, it just wouldn't go!
By TCR at 7:39 AM ON 02/28/08
"DinoRoger . . . do you have to wear a helmet when you use the internet?
Why couldn't it have ten weights, and be a limitless supply of free energy? We could hook the whole grid up to it!"
MY GOD!! That is the funniest thing I've ever read on the internet. I seriously couldn't stop laughing, I fell out of my chair, actually cried a little bit, I don't know why, it's friggin hilarious, I still can't stop laughing...By A Clue - Thank you so much, you have made my week, possibly even the month or year. Man that's funny!!
By Wow at 8:41 PM ON 03/03/08
I have a brilliant Idea... For light during the day, we could use a sunlight, and
at night we could sleep! (everyones scheduals would have to change so that the sun would be at the right time...) but hey, 100% efficiency!
on your cellphone!
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Wow:
I have a brilliant Idea... For light during the day, we could use a sunlight, and at night we could sleep! (every...More »