LED lamp without battery

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zac
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by zac » 09/09/05, 15:42

Hello
Nothing for the dog's tail? What a lost energy !!! :P
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MobyleX
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by MobyleX » 09/09/05, 18:04

Uh ... I was serious in what I said ...
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by Christophe » 12/09/05, 10:27

Regarding the Pearl lamp at 10 €, I add the following reaction:

"
The 5 LED lamp at Pearl lights up 5 hours? Weird. The other lamps light up for 30 minutes and with 2 or 3 LEDs.
On other sites it is said that this Pearl 5 LED lamp only lights up for 20 minutes. Pearl is kidding us?
And I add that with the shipping costs it's 27 euros.

It's always good to be honest. "
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by Christophe » 12/09/05, 10:28

jonule wrote:on the other hand on this site I obtained a lamp 70 leds 12V which consumes THAT 4.2 watts, for 50W approximately ... not bad ...

Yes, but at what price ?
For the moment it is quite overpriced (at least new) ... and therefore not really "econological" (a bit like fuel cells if you know what I mean ... :P )
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jonule
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by jonule » 12/09/05, 10:39

you mean price? I'm talking about consumption ... enifn!

well listen ... I got it for € 21 on e-bay at auction! so downright honest!

I must say that they illuminate much more than the first from pearl! ...

I also ordered a 12V neon, another 18led but with lateral dispersion, etc ...

all led lamps exist in 12V and 220V, in red, green, etc ...

I'm not looking to sell anything, but I announce what I have chosen, that's all, others can have the same experience!

:P :P
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by Christophe » 12/09/05, 11:25

jonule wrote:you mean price? I'm talking about consumption ... enifn!

well listen ... I got it for € 21 on e-bay at auction! so downright honest!

Well few people think that only in relation to the environment (even you talk about consumption and therefore financial aspect) ... It's a shame but it's like that ... This site aims, among other things, to help people reason better ...

Suppose that the lifespan of the LED bulb is 100 h and that of the classic bulb 000 h, that the classic 1000W bulb costs 50 € and that the kwhe is 1 €.

We have :

Cost of a conventional lamp for H hours + cost of bulbs for H = additional cost + cost of the LED lamp for H hours + cost of bulbs for H
H * 0.05 * 0.06 + 1 * H / 1000 = 20 + H * 0.0042 * 0.06 + 20 * H / 100000
it comes H = 5636 hours or "0.64" year continuously.

At the rate of 4 hours of average use per day, it comes 1409 days of use and therefore almost 4 years ... in France where the kwhe is very low.
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by The Passing » 12/09/05, 18:18

MobyleX wrote:Imagine a second applied to a vehicle: a super powerful coil fixed on each suspension of the car with a Neodymium magnet which crosses it, but fixed to the chassis: and it recharges enough to allow an ignition of the headlights without taking on the alternator !! Awesome!! In my opinion we could save up to 5% of fuel at night like that !! But hello editing ...

The principle applied to the infantryman already exists:
A backpack that produces electricity

A simple backpack mounted on springs could bring soldiers, but also professionals forced to operate independently, an elegant solution. The device, presented in the journal Science by a team from the University of Pennsylvania, consists in using the 5 to 7 cm vertical component of the movement induced by walking to activate an electric generator. The system weighs 5,6 kg. If we add a load of 38 kg and we walk at 6,5 km / h, we can produce 7,4 watts of electricity.

"This is 300 times more than with piezoelectric systems installed in the heels of shoes," said Lawrence Rome and his colleagues. These devices, which are limited by the maximum elasticity that can be given to the soles without making walking perilous, produce only 10 to 20 mW, which is far too little to power a cell phone or a GPS receiver (less than one watt).


http://www.lemonde.fr/web/article/0,1-0 ... 476,0.html
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Pouz
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by Pouz » 19/09/05, 06:28

The system weighs 5,6 kg. If we add a load of 38 kg


Infantryman or mule?
A 43.6 kg backpack and a pace of 6.5 km / h? Everyday ! : rolleyes:
Batteries have a bright future ahead of them ...
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gegyx
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by gegyx » 29/09/05, 22:52

A backpack that gives you energy when you walk

latest news from Quanthomme:

http://perso.wanadoo.fr/quanthommesuite/no...290905curiosa.htm
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DavidHervé
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by DavidHervé » 30/09/05, 08:51

The shakelight lamp I bought it because I find this kind of process rather economical
Indeed, the battery lamps when you need them, the batteries are generally dead or even squarely sunk in the case ...
I have not tried it over the long term but anyway even if it only lights up for 20 minutes
well a little shaker and it's off ... :)
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