My Trials and Tribulations with the Mini-Mag 2AA

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I'd been mulling over converting my Mini-Maglite 2AA to LED for a while, and toook the plunge today. I drilled the reflector out with a 3/16 in. bit, as suggested by one forum member, but found this too tight a fit to pass over the 5mm LED. Being that I was on the go (train, specifically) and away from a drill at this point, I used the phillips head on my SOG Paratool to bore the hole wide enough.

I filed down the leads, cut them to size, and first put in a Yellow Radioshack LED. (#276-351, 587 nm.) This worked ok, as I figured it would, as the "typical" voltage is 2.1 V, and it's max is 3. However, I switched from the old Duracells in the flashlight to new Radio shack alkalines, and pop, and a smelly micro-second later, the LED was gone. This is ok, as the yellow one was dissapointingly not bright (RAdioshack has 1900 mcd on the package. Anyone know what a yellow photon runs at? Mine is s lot brighter than this.) However, if the LED is supposed to be able to take 3 V, and I theroretically give it 3, which in reality is less, was it defective?

Now, I'm running it with a Radioshack Red LED (wants 1.7 V, can take up to 2.4, 3000 mcd, 660nm), and it's running a little hot, but has no problem with the new batteries, at least not initally. Was the problem in the first merely that I had run it for a longer total run time, even if it was on and off, and finally, the new batteries were just the straw that broke the camel's back? Or was it just a shoddy LED? Is there any reasonable way to heatsink this, or is it not worth my trouble? I like the idea of being able to switch between the incandescent lamp for power, and the LED for runtime and durability.

Overall, not bad. I would like to get some more power out of it, if this is possible, maybe by ordering a better Red LED online, or perhaps an Orange(does anyone make a Green that will run at about 3 V?)

Part of my problem, I guess, is that I like the idea of being able to run on plain old AA cells. Like my CD player, like my Infinity. It helps to standardize, even if the Infinity is not the brightest, the green works fine for me in most situations.

Stay Sharp,
Joe S.
 
Joe, I stated in the post to wallow that 3/16" bit a little to widen the hole so the LED would not rub the reflector. Seems you found out that a screwdriver would work as the "wallower", great. The battery issue of using two different types, AA & 2/3 AA, is really a stickler. The brightness difference between 3 & 4.5 volts on the white LED's is just too tempting to leave alone. I wanted a "racehorse" lamp though to use at work and this does it! I have measured the batteries after using them at work all week in one of my mods and the 1.5 volt was still at 1.77something volts and the 3 volt was down to 2.99something volts. I would guess I now have about a total of 2 hours runtime built up intermitantly on the lamp/battery combo and am pleased with the mod so far.
smile.gif
 
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Joe S:
I'd been mulling over converting my Mini-Maglite 2AA to LED for a while, and toook the plunge today. ...

...I like the idea of being able to switch between the incandescent lamp for power, and the LED for runtime and durability.

.... Part of my problem, I guess, is that I like the idea of being able to run on plain old AA cells. Like my CD player, like my Infinity. It helps to standardize, even if the Infinity is not the brightest, the green works fine for me in most situations.

<HR></BLOCKQUOTE>

As far as I know there is no good and easy way to convert a Minimag. The easy ones I tried are not satisfying.

If you - like me - want to keep the AA batteries then you have to use a stepup converter for the green, turquoise and white LED's (I don't know what's about the other colored LED). But that's not an easy conversion and IMO not a conversion you can easily reverse to the incandescent bulb. But with a DC-DC converter you can use more LED's (3...5) for a brighter light and they will still take less current than the original bulb. More about such converters you will find under
http://www.candlepowerforums.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=3&t=000983
and
http://www.candlepowerforums.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=3&t=001221 .

There are some more infos about this issue in the CPF and also on other homepages (see eg under
http://thelightsite.tripod.com/mods/mods_index.htm
or
http://mikro.e-technik.uni-ulm.de/persons/lares/LED_flashlight.html#V2 )

If you want the beam to go for a longer distance with LED's maybe you should take lenses as shown in this thread:
http://www.candlepowerforums.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=3&t=001242
 
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Stargazer:
Joe, I stated in the post to wallow that 3/16" bit a little to widen the hole so the LED would not rub the reflector. Seems you found out that a screwdriver would work as the "wallower", great. The battery issue of using two different types, AA & 2/3 AA, is really a stickler. The brightness difference between 3 & 4.5 volts on the white LED's is just too tempting to leave alone. I wanted a "racehorse" lamp though to use at work and this does it! I have measured the batteries after using them at work all week in one of my mods and the 1.5 volt was still at 1.77something volts and the 3 volt was down to 2.99something volts. I would guess I now have about a total of 2 hours runtime built up intermitantly on the lamp/battery combo and am pleased with the mod so far.
smile.gif
<HR></BLOCKQUOTE>

I didn't mean the reflector statement as an insult, I must have missed the wallow part.

I'm considering the battery switch to get to a blue or white. Where do you normally find 2/3 AA and 1/3 AA batteries? Online? Radioshack? Wally World? I don't recall ever seeing them.


Thanks.

Joe S.
 
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Joe S:
However, if the LED is supposed to be able to take 3 V, and I theroretically give it 3, which in reality is less, was it defective? <HR></BLOCKQUOTE>

Are you using a resistor in series with the led? Without one, even though the voltage is about right, the current will likely be high. Try 22 ohms with 3 volts or 10 ohms with 2.4 volts. That should be about the right neighborhood.
 
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