Fenix TK61 teardown and mod thread

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dazed1
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hmmm im far from expert, but doesn’t Fenix battery configuration put much less strain on the cells? i think 8A is not problem at all. I was told, even at 4.7A its like 2.2A per cell, so 8A should be around 4A per cell?

Fenix TK61 MOD> resistor, transistors, copper heatsink, Artic Cooling MX4, dedome, 3A > 5.7A ~ 1700 lumens > (600.000cd)

comfychair
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With multiple cells and higher voltage and a buck driver 8 amps or more isn't a problem. Well, if the driver is built to allow that kind of current. A buck driver converts the excess voltage into amperage.

The limitation with a direct drive driver isn't anything to do with the driver, but rather the lack of headroom between the input voltage and output voltage.

DB Custom
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Carried my TK61 doing 406.25Kcd and that was enough to shine across the Mississippi River at Vicksburg. Smile

Found new drivers had arrived while I was gone, so will be looking at bumping power…

Sorting things, will be back with a pic or 2


The old gent that was hanging out at the lookout, watching barges slide down the river as he’d done most of his life first told me it was impossible “Son, that there River is a MILE wide!”, then shook his head in disbelief at what he was seeing. (It’s not a mile wide at this point “only 1072M”, but is in other places) When told this power level would end up nearly doubled, he was incredulous. Love playing with lights like these around non-flashaholics. Smile

jcminar
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Finished up my first mod on my tk-61 did a gasoline de-dome and resistor mod. Everything went great super bright and an amazing throw. Never would have known about modding this light if it wasnt for blf. Just want to say thanks to everybody wo shared information with me.

dazed1
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Hi guys, some tips how to center the emitter/reflector on the TK61? i heard its very hard, and if the led is not perfectly centered you could lose like 15% of the CD, is this true? Sad

Fenix TK61 MOD> resistor, transistors, copper heatsink, Artic Cooling MX4, dedome, 3A > 5.7A ~ 1700 lumens > (600.000cd)

Slewflash
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DBCstm wrote:
Carried my TK61 doing 406.25Kcd and that was enough to shine across the Mississippi River at Vicksburg. Smile The old gent that was hanging out at the lookout, watching barges slide down the river as he’d done most of his life first told me it was impossible “Son, that there River is a MILE wide!”, then shook his head in disbelief at what he was seeing. (It’s not a mile wide at this point “only 1072M”, but is in other places) When told this power level would end up nearly doubled, he was incredulous. Love playing with lights like these around non-flashaholics. Smile

It’s a wonderful feeling when you amaze someone like this. Showing someone who’s used to Energizer lights which have one LED and a little aspheric lens a light pushing 1km in throw always blows people’s minds.

Slewflash 

ryansoh3
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Slewflash wrote:
DBCstm wrote:
Carried my TK61 doing 406.25Kcd and that was enough to shine across the Mississippi River at Vicksburg. Smile The old gent that was hanging out at the lookout, watching barges slide down the river as he’d done most of his life first told me it was impossible “Son, that there River is a MILE wide!”, then shook his head in disbelief at what he was seeing. (It’s not a mile wide at this point “only 1072M”, but is in other places) When told this power level would end up nearly doubled, he was incredulous. Love playing with lights like these around non-flashaholics. Smile

It’s a wonderful feeling when you amaze someone like this. Showing someone who’s used to Energizer lights which have one LED and a little aspheric lens a light pushing 1km in throw always blows people’s minds.

It makes my hair tingle with joy whenever I read this. (Okay, I’m weird.) XD

BLF ≠ B-grade Flashlight Forum

 

heggood
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RMM wrote:

Took this out last night.  All I can say is that my sight was limited only by the environmental haze / dust, not by the level of light.  I think I might like this one better with the dome left on but with the current cranked up, that way I get a bit wider beam.  The BTU Shocker cranked up has a better beam (MUCH wider, very similar intensity) than this IMO, but this is much lighter and the runtime is much longer!  

Did you end up leaving the dome on? Any idea of kcd and lumens with dome?

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heggood wrote:
RMM wrote:

Took this out last night.  All I can say is that my sight was limited only by the environmental haze / dust, not by the level of light.  I think I might like this one better with the dome left on but with the current cranked up, that way I get a bit wider beam.  The BTU Shocker cranked up has a better beam (MUCH wider, very similar intensity) than this IMO, but this is much lighter and the runtime is much longer!  

Did you end up leaving the dome on? Any idea of kcd and lumens with dome?

At 5.75A with dome ON it gets 330-350kcd at around 1900 lumens.

Slewflash 

dazed1
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So how does 350cd translate into meters?

My guess is 25% bump from stock? or around ~ 1050 meters?

Fenix TK61 MOD> resistor, transistors, copper heatsink, Artic Cooling MX4, dedome, 3A > 5.7A ~ 1700 lumens > (600.000cd)

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dazed1 wrote:
So how does 350cd translate into meters?

My guess is 25% bump from stock? or around ~ 1050 meters?

Just note that it’s 350,000 cd, not 350cd

to 0.25lux it’s square root of 350k*4
= 1183 meters.

Realistically you won’t see things at 0.25lux though… More likely 1 lux which is half the distance.

Slewflash 

dazed1
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Thank you. Useful light would be around 1/2 of that i guess? so 600 meters should be a good distance?

Fenix TK61 MOD> resistor, transistors, copper heatsink, Artic Cooling MX4, dedome, 3A > 5.7A ~ 1700 lumens > (600.000cd)

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dazed1 wrote:
Thank you. Useful light would be around 1/2 of that i guess? so 600 meters should be a good distance?

Yeah around 600 meters. Below 1 lux with the naked eye it’d be almost impossible to see that far out. Also a thing to remember is 4x the candela = 2x the throw due to the inverse square law. Eg. a 100kcd light will only throw twice as far as a 25kcd light.

Slewflash 

dazed1
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Yes i read on CPF that you need 4x cd, to get 2x the throw, thanks!

Fenix TK61 MOD> resistor, transistors, copper heatsink, Artic Cooling MX4, dedome, 3A > 5.7A ~ 1700 lumens > (600.000cd)

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RaceR86 wrote:

As a very quick and temporary test I connected the 70N02 like this:

Did not get over 1 amp output. Did I connect the legs in the wrong way or something?

Changed back to stock mosfet and saw 4,8A at the emitter. No harm done.

If this question is still open:

Do you have a specific reason for trying the 70N02? A quick look at the datasheet reveals that it is not designed for low logic levels on the gate (I don’t know what the logic level on the TK61 is). It will not be the optimal choise if the logic level is under 5 V, as it will not open fully. Also, wiring out transistors like that from a DC/DC converter may result in some crazy EMC/functional issues… Smile

EDIT:

For a good N-MOSFET, you could try this one. It seems to have a very good price/performance ratio, and it will fit into the PCBs standard footprint (sot-23).
http://www.mouser.com/ds/2/115/ds31946-65244.pdf

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Samppa wrote:
Do you have a specific reason for trying the 70N02?

I had it available in front of me and was curious. Wanted to help RMM to push the stock driver. Unless the stock driver could do extreme amps I was moving on. And it seems it could not nearly as many amps as I had plans for.

Ive finally got my HX-1175B drivers yesterday (only 64 days after I first ordered them), so Ill put one of those in my TK61 like I had planned ages ago. Seems like others have already beaten me too it.

Currently got some other projects that's been moved higher on my to do list. I think you guys might like one of them, ill share if if successful. But this time I want to finish my own project before sharing details.

Ill update this thread later on with how I did my TK61. Might compare with Supbeam K50 too.

Thanks for the tip Samppa. Welcome to the forum btw! Smile Always nice to have people with some electronics knowledge helping with mods!

Gotta tell. Just got in from playing with the TK61 and my latest psycho bright light. (Similar size as TK61). Awesome stuff! Regular car headlights look like old incandesent Maglies in comparison. Big Smile

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Samppa
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Thanks! Your super flooder with 12 emitters looks amazing! Smile

I’m always interested in extreme mods, both flood and throw. I have the TK61vn which is supposed to throw around 600kcd, but I’m already got used to it… Need something even stronger soon!

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FINALLY, after 4 + months waiting, and pain, my TK61 is dedomed properly! and compared to the first mod, when the light was loosing from TK61 stock, (dunno what went wrong) this time, the light has exactly 2x cd!!!!!!!!! so happy now! we measure double the cd 5 times in a row, 10, 15, 20, 25, 30m!

Next 3A> 5.75A, stock paste > Artic Cooling MX4, copper heatsink added 2.5mm, led perfectly centered and so on Smile

Fenix TK61 MOD> resistor, transistors, copper heatsink, Artic Cooling MX4, dedome, 3A > 5.7A ~ 1700 lumens > (600.000cd)

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After a long wait Smile As achievement give 5.75A to the led?

Sorry for my bad English…

dazed1
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I didn’t tested, will replace the parts in few days, but i got the exact same parts as Vinhn, so it would be around 5.7 or 5.8A.

Fenix TK61 MOD> resistor, transistors, copper heatsink, Artic Cooling MX4, dedome, 3A > 5.7A ~ 1700 lumens > (600.000cd)

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On a sidenote. Have you measured 4,7A to each emitter in your TK75??

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dazed1
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No, but again using the exactly same parts as other user who reported 4.7A, so i guess its 4.6/4.7A?

I will measure both of them in few days, and report back.

Fenix TK61 MOD> resistor, transistors, copper heatsink, Artic Cooling MX4, dedome, 3A > 5.7A ~ 1700 lumens > (600.000cd)

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dazed1 wrote:
I will measure both of them in few days, and report back.

Looking forward to hear the results.

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And I’ve managed to Poof! 5 XM-L2 U2 1D emitters so far. Tried everything to keep it all under control, had it down to 4.83A and did the math on resistors, bumped it just a wee bit….Poof!

So now I have it running an Luminus SST-50. I put resistors on it that have actually lower resistance than stock but the emitter is “only” getting 5.60A. Not a throw monster by any stretch of the imagination, but a decent light nonetheless set up this way. Have some parts on the way, will try again later. Tired of frying XM-L2’s though.

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Can you share all details on your setup Dale, and what you have tried. (Preferably in the HX1175B thread...)

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DBCstm wrote:
And I’ve managed to Poof! 5 XM-L2 U2 1D emitters so far. Tried everything to keep it all under control, had it down to 4.83A and did the math on resistors, bumped it just a wee bit….Poof!

So now I have it running an Luminus SST-50. I put resistors on it that have actually lower resistance than stock but the emitter is “only” getting 5.60A. Not a throw monster by any stretch of the imagination, but a decent light nonetheless set up this way. Have some parts on the way, will try again later. Tired of frying XM-L2’s though.

You’re blowing up XML2s at 4.83A?

Slewflash 

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Slewflash wrote:
You're blowing up XML2s at 4.83A?

Probably current spikes. Ive started a suitable thread for that too. Big Smile

"At what current do you kill LEDs - Which driver was used"

Its not the current that kills them.

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RaceR86 wrote:

Slewflash wrote:
You’re blowing up XML2s at 4.83A?

Probably current spikes. Ive started a suitable thread for that too. Big Smile

“At what current do you kill LEDs – Which driver was used”

Its not the current that kills them.

Thanks for the link, you’ve made an interesting thread. I’ll give it a read. Smile

Slewflash 

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This driver seems to make big jumps with small changes. The bump up from 4.83A is what killed it. I had one running at 7.13A that seemed reliable, but I wasn’t able to get the throw on it that I thought it should be making, so I changed the emitter and poofed a few more.

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Man, that's alot of xml2's to lose.  I lost a bunch to a FT "3T6" driver once.  It really hurts.

I know we are talking about it in the other thread, but whiles I'm thinking about it.  Have you tied a different HX-1175 in any of these attempts?

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