Match's Mods: 6x XML Maglite project

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Match
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Match's Mods: 6x XML Maglite project

Gentlemen,

  The following is an account of what happens when I get bored and have a box full of emitters to play with.  Since the Cree XML became the new Belle of the Ball, a lot of torches are getting modded to accept one, three, or in one case seven of 'em (underdriven).  Curiosity got the better of me one night, so I set about seeing what I could do. I wanted a torch that could meet the following objectives:

- 6 xml's driven @ 2.5-3 amps 

- Built on a 3D maglite (because I had one handy, no other reason)

- No Li-ion (don't want any "poofs" with a multi-cell setup)

- Must not be a 30sec "wow" light (i.e. good thermal management for >20min)

Let me preface this post by saying that this isn't a completed project (to me, anyways...).  Consider this more of a proof of concept and a working design.

Here's how I went about it:

After doing some basic quick calcs, I realized that there's no way the stock maglite head would reasonably meet the above requirements, so a little time was spend designing a new one.  I started with a 4"x4"x6" hunk of pure aluminum, mainly because I had a scrap piece on hand. Plenty of time at the lathe produced a rough, but functional prototype head.  Looks like this here: (no picking on the not-so-smooth finish)

and here it is as compared with the stock head off of a 3D maglite:

What's hard to see is that where the emitters are mounted is over an inch thick, as compared to most factory pills that run a couple of mils. Not knowing how radical I'd have to go with the fins I left them relatively shallow.

So...now it's time to stuff it full of XML's and get to testing.  For consistant and accurate thermal testing I used a regulated bench power supply and a Fluke 724 for temp monitoring.  These two shots are at 5min and 10min respectively:

The thermocouple is mounted inside the center lead hole between all the emitters. That, combined with the thermal conductivity of pure aluminum should give a pretty accurate idea of base temperature.  Interestingly enough at about the 15min mark the temps were at 125F and at 20min was at 130. After a half an hour temps were a bit over 135, which is were I stopped the test.  Note that this was with a full 3 amps going to each led for the entire duration.  The cells I plan on using won't be able to sustain this, and the head will be attached to a little over a foot of maglite tube so thermals should stay in check.  

The following series of pictures shows what 6 Cree XML leds look like at various current levels.  Those levels are 500ma, 1a, 2a, 3a, and just under 4 amps.  There's been talk about a sweet spot around 2.5a for this emitter, and in testing I saw nothing to disprove that.  The difference between 1a and 2a is substantial, but 2a to 3a less so. Output slows rapidly after that. The difference betwen 3a and 4a was much less than the difference between 2.5 and 3. Between 4a and 5a I could disern no noticable difference.  I didn't use a lightbox to tell, only a visual evaluation...and honestly, for me personally it doesn't matter a bit if there's a small lux gain if I can't tell by looking at it.  I don't in daily practice use my torches to illuminate lux meters.

The "amps" meter shows the current in each of these shots:

So, now come the part were we need to get this somehow mounted and powered so it's actually useful as a torch.  Considering the softness of pure aluminum, threading was out but that's ok, since my threading ability on a lathe is lacking.  Tight tolerances on the other hand I can do, so I made it a press fit with a set screw.  The negative lead in the series is mounted to the head itself, while the positive is fed down and mounted on a plastic dowel that fits perfectly into a stock incan mag bulb holder.  That's right, it's a slip-on with no mods required to the host other than removing the head and bulb.  Here's a shot of the post and set screw:

Powering all of that xml goodness is another trick, sort of... Being a minimalist and a subsciber of the KISS method of engineering I used 12 NiZn AA cells in series for 22.25v fully charged and run all of it direct drive.  This simplifies a few things, first and formost saving cost and complexity of a driver of which few out there could handle this, and also prevents the stock mag switch from having to see more than 3.2amps.  Win-Win! I do miss out on modes and that ever useful SOS mode (blah), but who am I kidding...this isn't a EDC.  The neat thing about these cells are their ability to provide high current at a higher than normal voltage.  As Steve Jobs would say, here's where it gets "magical".  The system provides a self regulation effect of sorts in that as the emitters warm up the vf increases thereby limiting current and heat.  What I've noticed is @ 3.2-3.4a at start-up, and then after about 5 minutes current drops to around 2.5-2.8a and holds there for about the next 10minutes then slowly starts to fall off.  As of now, I've yet to do a full runtime test but will update when completed.

Well, enough about the boring details...Let's see how it all turned out:  Here's the before and after shots:

And a nicer one using the wife's fancy napkin as a background: (kinda looks like a M24 german hand grenade...not intentional...)

As you can see, I used Carlco TIR lens's. They are the narrow one's spec'd for mc-e emitters.  I did try using the narrow ones for the xpg emitters, but the beam looked worse.  Why did I use these?  They were cheap and I had a bunch on hand (notice how I work now?).  Let's see how they perform with some beamshots.  I'll be comparing it to the Zebralight SC60 and the ever popular MF xml drop-in in a solarforce host. Each set will consist of a control shot, the SC60, the MF drop-in, and then the new creation in that order. (it'll need a name eventually...maxi-match? - almost sounds like a feminine product...).  

Please note that there was a full moon out and the pollen count is off the charts in South Carolina this time of year, so distance shots didn't turn out so well.  I'll update them when it finally clears up.

Here's the first shots at the big oak tree in my back yard. All exposures set to 2sec:

 Distance @ 35yds 

Control:

SC60:

MF XML drop-in:

The big bugger...

Yup...definately not an up close work light.... The reflection off of anything closer than 20yards is actually quite bothersome to look at.  Kinda neat!  Let's look at some distance shots now.  Opposite to my backyard is a golf course, so I snuck over there for some more shots.  Again, all the tree pollen in the air kind of ruins the shots and makes everything look real hazy, but this will still give you an idea.  I had some 400yd beamshots, but after reviewing them they were useless due to the pollen, so here's the midrange shots: 

Tree line is @130yds:

Control shot:

SC60:

MF xml Drop-in:

The new BLF delight "Match-edition": (scratch that...too cheezy...)

 

I don't have a I.S. yet to measure total lumen output, but lux readings at 1 meter are @ 48klux, making it my second best throwerTongue out. Again, kinda neat. Does it meet the requirements laid out in the opening paragraph?  I'd say closer than I expected.   I'm not sure how to wrap up this build write-up, since I'm really not done yet.  I guess  really all that's left is just final polishing on the head and making a better battery holder.  Oh yea, I did bore the body out to accept 4 aa cells in a carrier, then realized I could just stick with 3AA 4 deep by removing the spring and boring out the tailcap.  In a nod to Don, it's all held together by electrical tape and popsicle sticks Wink

This took longer than expected to write up, so I'm sure I missed something.  If you have any questions, please ask away!

Thanks for reading and humoring me,

-Match

Update:

 

 It's been awhile, but here is a much needed upgrade by the addition of a fantastic driver called the H6Flex.  The whole works is now being powered by 4 26650 LifePO4's on a 3D host.  The difference is outstanding.  It used to be the light only had two modes : Pitch black and Rapture.  Now I have a choice of 8 different modes from 35 lumens up to over 5,100lumens...and all current regulated.  The UI is really outstanding on this driver and worthy of a write-up all by itself.  Suffice to say that this is the one light now that can truly do it all from emergency hurricane light with a runtime over 2 weeks in the low modes to impromptu fire starter in high mode while pointed at combustibles...and it also makes a dandy blunt weapon to boot!

 

 

 




Edited by: sb56637 on 08/26/2014 - 17:29
mizjif
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WHOHOHOHOOOOO....that is sweeeeet. *wipes away drool*....That is freaking bright. Longer beam shots are needed hehe. 

Oldienea
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Tongue out

It seems, in the world of Match the word "impossible" just doesn't exist.

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Tongue out

It seems, in the world of Match the word "impossible" just doesn't exist.

fishinfool
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WOW!!!  That sucker is bright!!

Way to go Match!!! 

 

 

Don wrote:

"But as I said long ago, you are more likely to be killed by a dead fish dropped by a seagull in the Sahara Desert than by a lithium ion

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Very well done ....  

How did you hook up the emitters ? 

 Always remember , the easiest thing in the world to do , is to expel hot air from your lungs and through some vocal chords ..
The resulting sound may , or may not be worth listening too ….

 

SecaRob
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Match,  that is incredible.  Nice work!

jb1
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Hey Match, is there any chance you'd be willing to make & sell some more of these beasts? 

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Incredible...

Match
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Thanks for the nice comments, guys.  

 Old4570 wrote:

How did you hook up the emitters ? 

It's kind of hard to tell from the pics, but the emitters are wired up in series.  Having 6 xml's in parallel seemed like trouble trying to keep load sharing constant. Not to mention the combined vf mated up well with the powergenix cells.

jb1 wrote:

Hey Match, is there any chance you'd be willing to make & sell some more of these?

This will most likely be the only one.  Besides, it's not really what you'd call a budget light. You can build one though, it's a fairly straightfoward deal.  If you want the dimensions for milling the head, let me know.  

Also, in all honesty, this torch is really too bright for social work.  Fun as hell to play with though...Tongue out

Don
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That definitely has the Don seal of approval even if I can't see the duct tape Wink

 

Isn't the current drop more likely to be voltage bleeding off the NiZn cells?

 

Getting 12AA into a 3D Mag is tricky - did you have to bore it to make them fit?

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

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I like the look of it!! Reminds me of my recent battle with soft aluminium!!! Did I say I Love the way it looks?

 

Hexa-Match?   (6 match)

6x3 match?

Unfortunately its not related to 24, thats the german nade...

"like everyone else - I’m looking for my next “last” flashlight" -  ohnonothimagain

Match
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Don wrote:

Isn't the current drop more likely to be voltage bleeding off the NiZn cells?

Getting 12AA into a 3D Mag is tricky - did you have to bore it to make them fit?

Wow...I really was tired when I typed this up.  Yes, the cell voltage does drop as they're used, but not as much as I had first expected.  That's what led me to the slight increase in vf helping to limit current and indirectly, voltage bleedoff.  

Yes, I did bore the mag body to accept a 4x3 cell setup, but in the end just went with a 3x4 array which only required opening up the tailcap a bit.

Don, tape and popsicle sticks, just for you:Wink

skulless
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That is one INCREDIBLE mod...take a bow

Don
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Match wrote:

Don wrote:

Isn't the current drop more likely to be voltage bleeding off the NiZn cells?

Getting 12AA into a 3D Mag is tricky - did you have to bore it to make them fit?

Wow...I really was tired when I typed this up.  Yes, the cell voltage does drop as they're used, but not as much as I had first expected.  That's what led me to the slight increase in vf helping to limit current and indirectly, voltage bleedoff.  

Yes, I did bore the mag body to accept a 4x3 cell setup, but in the end just went with a 3x4 array which only required opening up the tailcap a bit.

Don, tape and popsicle sticks, just for you:Wink

 

I was going to ask about the battery holder, glad to see the Don school of engineering is alive and well. Smile

Certainly a lot cheaper than buying one of the premade versions.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

Match
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Don wrote:

...Certainly a lot cheaper than buying one of the premade versions.

Yup.  I'll eventually get around to making my own, but I can't see paying someone ~$50 for a bit of plastic and steel rod...

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Fantastic, thanks for sharing! You may consider to change your headline to Match's Mods and Custom

Match wrote:

...(it'll need a name eventually...maxi-match? - almost sounds like a feminine product...).  

Mad Match comes to my mind... 8)

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Good grief Match you're competing with the sun and coming out on top! :bigsmile: Nice piece of work there! Brilliant idea with the AA battery array, when I first saw this post I immediately wondered how you would power so many XM-Ls with 3 puny D cells.

Congrats on a great project Match, please keep us updated.

Needless to say, frontpage'd and sticky'd.

Budget Light Forum ...where Frugal meets with Flashlight!

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Match's Sun PE (Personal Edition)

Did you try if you can burn a piece of paper with?

Great custom work! I would have used 6x D nimh cells that would probably suffice to power neatly that thing... providing you had a 6D maggie. But a 6D maggie in 6xXM-L can easily be called:

Match's Photon Baton Extreme

If we don't blind you first we can whack you just fine...

Preorder now!

1st 10 customers will be given a survival kit and welding mask as a standard safety device during daylight use.

kragmutt wrote:

They're gonna send you a green redcat with a black LED.

Match
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Thanks again for humoring me guys.

Huny74 wrote:

Mad Match comes to my mind... Cool

I love it!  The missus does think I'm quite mad...

Another name I was considering was the H.S. Persuader.  Every person I've shown this light to, including my dear sweet mother, has shouted "Holy Shit!" once I turned it on.

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Budgeteer wrote:

Match's Sun PE (Personal Edition)

Haaa! +1

Budget Light Forum ...where Frugal meets with Flashlight!

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Match wrote:

Thanks again for humoring me guys.

Huny74 wrote:

Mad Match comes to my mind... Cool

I love it!  The missus does think I'm quite mad...

Another name I was considering was the H.S. Persuader.  Every person I've shown this light to, including my dear sweet mother, has shouted "Holy Shit!" once I turned it on.

Even Chuck Norris would want one!

kragmutt wrote:

They're gonna send you a green redcat with a black LED.

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Im still looking at that thinking that the grooves for the fins could and should be much deeper.............   hahahah! where do you find such chunks of aluminium?

"like everyone else - I’m looking for my next “last” flashlight" -  ohnonothimagain

Match
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okwchin wrote:

...where do you find such chunks of aluminium?

At work we use 6"x14"x50foot sections as bus work for carrying large amounts of power to a DC arc furnace.  This piece came of the corner of a scrap chunk that was sitting around in mud for the last 6+ years...

 

As a side note, I just realized that Boaz came close to designing this light for me awhile back in this posWink.

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wait... 135 deg F is not even 60 deg C... How is it possibly soo cool!!! Whats your ambient temp?

 

My single SST-50 torch from 23 deg C (74F), made it past 57 deg C (135F) in under 14 minutes, and its a well heatsinked head design.. Thats crazy.

"like everyone else - I’m looking for my next “last” flashlight" -  ohnonothimagain

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Howly mowly, man. What a torch Shocked Match's Pocket Sun Crown Hands down 8)

PS: paint it in black to MATCH the body, yeah Silly

PS2: you have to create a good 3xAA batt holder, like this one.

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You Sir, are a very sick man! Are those ants that I see leaping off that smoldering tree just before the bark ignites? Those poor ants! Yell
 
Well done Match. I want one! You might want to pull the battery pack out after each use to let it cool down separately of the light. Ive had 3 of my Powergenix AA's leak on me during heavy discharge.
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SashiX wrote:

PS2: you have to create a good 3xAA batt holder, like this one.

 

Those tend to have rather high resistance. They're probably not suited to currents of over an amp.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

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very impressive

how2
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Match your nuts.Laughing

 

You will burn the house down

Match
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okwchin wrote:

wait... 135 deg F is not even 60 deg C... How is it possibly soo cool!!! Whats your ambient temp?

 

Couple reasons for this:  

-Ambient temp at time of testing was @ 65F.  

- Hard to tell from the pics, but the head is really big... so even without deep grooves, there is a lot of surface area.  

- All areas of the head are also quite thick, from tip to toe.  Combined with being pure aluminum vs an alloy leads it to heat up very evenly

- Plain surface. There's no anodizing or paint to act as a small insulation barrier.

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