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#1
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Led Flashlights
This improved version of battery was the self contained dry cells.
These self contained dry cells were more beneficial than the led acid batteries, because they were smaller and were much more reliable. During the same period, a new kind of led flashlights was developed. These led flashlights were named as the dynamos. Dynamos are the led flashlights that make use of the energy, which is created by the movement of the led flashlights. Dynamos became popular and much more practical at that period of time, because the storage density of batteries was not too much. Dynamos proved to be much more practicable during that period of time. Not every part of the world had laws regarding the compulsion of having led flashlights. In UK the led flashlights group actually went against the law of led flashlights having the rear lights. This was because; they thought that this law will reduce the significance of the motorist’s obligation to stop when they would see a bicycle within a clear distance. http://www.eclipseledcompany.com/ |
#2
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Led Flashlights
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#3
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Led Flashlights
On 2011-06-07, willshak wrote:
I think samaden was PUI. Posting Under the Influence. He asserts that flashlights had lead acid batteries. Lead acid batteries are used in automobiles. (did you have to check the water level occasionally?) Coolest flashlight I ever had was a "moon" or "space" flashlight, which I bought new in the early 70s. It was supposed to be a spinoff from space technology. It was about the size of a 4oz can of mushrooms, maybe an inch longer. It was made of chromed plastic, had a twist on/off switch, incandescent bulb, and was completely sealed. There was no way to replace anything. You jes turned it on and waited for it to come on. When new, that was about 5-10 secs. Later, it became as long as a minute. Bottom line, owned and used that little flashlight for almost 15 yrs before it finally launched its last lumen. I used it hundreds of times and it was my always-there, always-works, emergency flashlight and it did its job perfectly. At one point it sat in a drawer, unused, for almost 5 yrs. Then I had a power outage and coldn't find my main flashlight. I remembered my lil' space light, dug it out, turned it on, and after about a minute, it came on, almost bright as new. If I could find another one, I'd buy it in a heartbeat. I've never seen another like it, since. nb |
#6
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Led Flashlights
"samaden" wrote snip Go smoke your spam somewhere else. |
#7
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Led Flashlights
Andy comments:
I have a number of those small LED flashlights that I got free from Harbor Freight for visiting the store. They use three AAA cells in series driving nine LEDs in parallel, with no current limiting. When on, the drain from the AAA cells is about 160 ma. As a retired engineer, I made up a little thingy about the size of a dime which can be inserted in the back between the battery terminal and the little spring. This inserts a 100 ohm resistor in series with the AAA cells and drops the current drawn to about 16 ma. Since the current draw is 1/10 of an unmodified flashlight, the AAA cells will last a bit longer than 10 times as long...... The light output is reduced, but not drastically so. All the LEDs still light and the light output is more than enough to see your way in a darkened room or read a book by..... I have modified all my little LED flashlights this way, and all work about the same. My "thingy" is a piece of double sided G-10 with a small 1/4 , 100 ohm resistor put in a slot which connects one side to the other. The shape is like a dime, so it will easily fit right in behind the AAA cells in the back... Just wanted to pass this along in case someone here would like to try it... Andy in Eureka, Texas |
#8
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Led Flashlights
On Jun 7, 9:01*pm, Andy wrote:
Andy comments: * I have a number of those small LED flashlights that I got free from Harbor Freight for visiting the store. *They use three AAA cells in series driving nine LEDs in parallel, with no current limiting. *When on, the drain from the AAA cells is about 160 ma. * *As a retired engineer, I made up a little thingy about the size of a dime which can be inserted in the back between the battery terminal and the little spring. *This inserts a 100 ohm resistor in series with the AAA cells and drops the current drawn to about 16 ma. * *Since the current draw is 1/10 of an unmodified flashlight, the AAA cells will last a bit longer than 10 times as long...... * *The light output is reduced, but not drastically so. All the LEDs still light and the light output is more than enough to see your way in a darkened room or read a book by..... * * I have modified all my little LED flashlights this way, and all work about the same. * * My "thingy" is a piece of double sided G-10 with a small 1/4 , 100 ohm resistor put in a slot which connects one side to the other. The shape is like a dime, so it will easily fit right in behind the AAA cells in the back... * *Just wanted to pass this along in case someone here would like to try it... * * * * * * * * * *Andy in Eureka, Texas I have bought at least 9 led flashlights. Only a couple were reliable. I always have to bang on them. Those colored ones were the worst. The best which I use most often, and also has a fairly warm light, I bought at Target, River Rock, and of course, unavailable. I bought some from Deals Extreme and none were reliable. Greg |
#9
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Led Flashlights
On Jun 7, 12:17*pm, samaden wrote:
This improved version of battery was the self contained dry cells. These self contained dry cells were more beneficial than the led acid batteries, because they were smaller and were much more reliable. During the same period, a new kind of led flashlights was developed. These led flashlights were named as the dynamos. Dynamos are the led flashlights that make use of the energy, which is created by the movement of the led flashlights. Dynamos became popular and much more practical at that period of time, because the storage density of batteries was not too much. Dynamos proved to be much more practicable during that period of time. Not every part of the world had laws regarding the compulsion of having led flashlights. In UK the led flashlights group actually went against the law of led flashlights having the rear lights. This was because; they thought that this law will reduce the significance of the motorist’s obligation to stop when they would see a bicycle within a clear distance.http://www.eclipseledcompany.com/ THAT'S RIDICULOUS.....ON THE REST OF THE PLANET, EARTH .... A DYNAMO WAS / IS A SMALL TYPE OF GENERATOR....NOT ANY-KIND OF LIGHT AT ALL...AND IN FACT MAKES BATTERIES UNNECESSARY. SHEESH ! YOU MAKE ENGRISH FOLK SOUND LIKE GARDEN VARIETY WEIRDOES. ARE YOU 100% SURE OF WHAT YOU ARE SAYING? PAT ECUM TGITM |
#10
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Led Flashlights
In article ,
Andy wrote: Andy comments: I have a number of those small LED flashlights that I got free from Harbor Freight for visiting the store. They use three AAA cells in series driving nine LEDs in parallel, with no current limiting. When on, the drain from the AAA cells is about 160 ma. As a retired engineer, I made up a little thingy about the size of a dime which can be inserted in the back between the battery terminal and the little spring. This inserts a 100 ohm resistor in series with the AAA cells and drops the current drawn to about 16 ma. Since the current draw is 1/10 of an unmodified flashlight, the AAA cells will last a bit longer than 10 times as long...... The light output is reduced, but not drastically so. All the LEDs still light and the light output is more than enough to see your way in a darkened room or read a book by..... I have modified all my little LED flashlights this way, and all work about the same. My "thingy" is a piece of double sided G-10 with a small 1/4 , 100 ohm resistor put in a slot which connects one side to the other. The shape is like a dime, so it will easily fit right in behind the AAA cells in the back... Just wanted to pass this along in case someone here would like to try it... Andy in Eureka, Texas Very, very interesting. To understand how you built it, I'd sure like to see some photos, maybe even on a "MACRO" setting. Does seem to me that a dime is pretty thick for inserting behind one of those AAA batteries.] And, what's a G-10 (double sided)? You say "right in behind the AAA cells" ie plural -- if they're in series, all you need do is put it *somewhere* in the circuit, ie behind any *one* of the cells? Or am I missing some basic concept of what you've done? Question: how did you measure the amps pulled? That is, where and how did you break the circuit so you could insert the ammeter (part of a vom)? At least in my 3-AAA led lights and headlamps, it's a pretty tight fit. Obviously you have some neat technique that I'd like to learn! Thanks, David |
#11
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Led Flashlights
David Combs wrote:
In article , Andy wrote: Andy comments: I have a number of those small LED flashlights that I got free from Harbor Freight for visiting the store. They use three AAA cells in series driving nine LEDs in parallel, with no current limiting. When on, the drain from the AAA cells is about 160 ma. As a retired engineer, I made up a little thingy about the size of a dime which can be inserted in the back between the battery terminal and the little spring. This inserts a 100 ohm resistor in series with the AAA cells and drops the current drawn to about 16 ma. Since the current draw is 1/10 of an unmodified flashlight, the AAA cells will last a bit longer than 10 times as long...... The light output is reduced, but not drastically so. All the LEDs still light and the light output is more than enough to see your way in a darkened room or read a book by..... I have modified all my little LED flashlights this way, and all work about the same. My "thingy" is a piece of double sided G-10 with a small 1/4 , 100 ohm resistor put in a slot which connects one side to the other. The shape is like a dime, so it will easily fit right in behind the AAA cells in the back... Just wanted to pass this along in case someone here would like to try it... Andy in Eureka, Texas Very, very interesting. To understand how you built it, I'd sure like to see some photos, maybe even on a "MACRO" setting. Does seem to me that a dime is pretty thick for inserting behind one of those AAA batteries.] And, what's a G-10 (double sided)? I think G10 is a phenolic/fiberglass board with copper plating on both sides. http://www.electricalinsulationmater...m/g10-fr4.html |
#12
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Led Flashlights
Measuring amps is easy enough. Remove the tail cap, put one
lead of ammeter on the back of the battery pack. Other lead on the inside threads of the case / barrel. Can't remember where I heard this, but the three AAA flashlights from HF run max amperage, from the AAA cells. To use that light module on D cells for example, would need a current limiting resistor of some value. Not sure what value. -- Christopher A. Young Learn more about Jesus www.lds.org .. "David Combs" wrote in message ... Question: how did you measure the amps pulled? That is, where and how did you break the circuit so you could insert the ammeter (part of a vom)? At least in my 3-AAA led lights and headlamps, it's a pretty tight fit. Obviously you have some neat technique that I'd like to learn! Thanks, David |
#13
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Led Flashlights
"HeyBub" wrote in message m... David Combs wrote: In article , Andy wrote: Andy comments: I have a number of those small LED flashlights that I got free from Harbor Freight for visiting the store. They use three AAA cells in series driving nine LEDs in parallel, with no current limiting. When on, the drain from the AAA cells is about 160 ma. As a retired engineer, I made up a little thingy about the size of a dime which can be inserted in the back between the battery terminal and the little spring. This inserts a 100 ohm resistor in series with the AAA cells and drops the current drawn to about 16 ma. Since the current draw is 1/10 of an unmodified flashlight, the AAA cells will last a bit longer than 10 times as long...... The light output is reduced, but not drastically so. All the LEDs still light and the light output is more than enough to see your way in a darkened room or read a book by..... I have modified all my little LED flashlights this way, and all work about the same. My "thingy" is a piece of double sided G-10 with a small 1/4 , 100 ohm resistor put in a slot which connects one side to the other. The shape is like a dime, so it will easily fit right in behind the AAA cells in the back... Just wanted to pass this along in case someone here would like to try it... Andy in Eureka, Texas Very, very interesting. To understand how you built it, I'd sure like to see some photos, maybe even on a "MACRO" setting. Does seem to me that a dime is pretty thick for inserting behind one of those AAA batteries.] And, what's a G-10 (double sided)? I think G10 is a phenolic/fiberglass board with copper plating on both sides. http://www.electricalinsulationmater...m/g10-fr4.html If you turn it backwards, can you use your flashlight as a firestarter? ;-) Steve Heart surgery pending? www.heartsurgerysurvivalguide.com Heart Surgery Survival Guide |
#14
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Led Flashlights
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#15
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Led Flashlights
Naah, for that you need steel wool and 9v battery.
-- Christopher A. Young Learn more about Jesus www.lds.org .. "Steve B" wrote in message ... I think G10 is a phenolic/fiberglass board with copper plating on both sides. http://www.electricalinsulationmater...m/g10-fr4.html If you turn it backwards, can you use your flashlight as a firestarter? ;-) Steve Heart surgery pending? www.heartsurgerysurvivalguide.com Heart Surgery Survival Guide |
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