5.75A to emitters TK70!

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Hyprmtr
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5.75A to emitters TK70!

I decieded to mess around with my TK70 today and got some pleasing results! First off the light was upgraded with XML2-U2 LEDs a few months ago and I was pleased but not completely happy. Here we go…

First I played with a few different resistors and never got above 2800ma to the dies with the Tenergy 10000mah D cells.
It was brighter but still not bright enough!

I then bridged the sense resistors over and put 3 26650 flames to it. I got 5.75A to the emitters now. I think I’m happy now! It gets hot quick. I may pot the driver so it will last. I havent yet checked temps since this mod was done just 10 minutes ago. Haha. I will update when my 32650 flames get here amd I can run the light fully assembled. I cant wait for beam shots!

bdiddle
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5.75 to each led?

Newb

TrakTuned
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Shocked Shocked Shocked

Throw should be very high on this one

BLF members are hilarious:
“That’s like saying “My car has top-speed of 200k millimiles per hour”. Why not to just say 10 Ah?”

RaceR86
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Like! Smile

BLF LED database – collaboration spreadsheet and latest news about where to buy LEDs
http://budgetlightforum.com/node/19342

Hyprmtr
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bdiddle wrote:
5.75 to each led?

Yes! I cant believe it myself! I lost the high/mid/low modes but I still have strobe and sos.

MountainKing
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Man you modded such an expensive thing!

Never ever forget and forgive. Niwal**er new kid on the block trying to act tough.
http://budgetlightforum.com/node/24847
Do not support this brand.

DINODIRECTSCAM COMPANY. DO NOT BUY
http://budgetlightforum.com/node/11324?page=2#comment-254983

Hyprmtr
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MountainKing wrote:
Man you modded such an expensive thing!

I have had this light since about 2008? Maybe it was 2009. I dont remember. I had problems with it a couple years after I got it. It would flicker and turn off by it self. It was a PITA getting it apart. I ruined the stock T6 emitters when I took it apart. So I upgraded to xml2-u2 emitters. I couldnt stop there! Haha!

Ken

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Quick update,

I got it put back together and measured lux at 10 meters. I got 2190 lux. I used (3) 26650 flames I made a short filler with a piece of brass to get the contact in the battery tube. I did measure current at the emitters with the light assembled and it was 5.1A. Probably because of the extra resistance of the brass spacer. Beam shots tonight! (Still daylight here)

Ken

2.4A

5.1A

Hyprmtr
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There it is. I barely got one shot in. Camera battery died. Im charging the battery in the camera. I will probably fall asleep before it charges. I been up since 4:45 this morning!

Ken

TrakTuned
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Thing looks beast! Thanks for the shots.

BLF members are hilarious:
“That’s like saying “My car has top-speed of 200k millimiles per hour”. Why not to just say 10 Ah?”

MountainKing
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looks beast?

it IS beast. lol

Never ever forget and forgive. Niwal**er new kid on the block trying to act tough.
http://budgetlightforum.com/node/24847
Do not support this brand.

DINODIRECTSCAM COMPANY. DO NOT BUY
http://budgetlightforum.com/node/11324?page=2#comment-254983

bibihang
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219kcd!!

Dedome them!!

Hyprmtr
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Thank guys! Im going to do some run times and heat tests today hopefully. Will update.

I have dedomed a lot of leds. Im not to crazy about tbe color afterwards. Im happy with 219kcd!

This light is sure a lot lighter now with 3 lithium batteries!

Oh yeah, strobe is wicked on this thing!!!!! J)

Ken

tatasal
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What is the input voltage range of a stock TK70?

Hyprmtr
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tatasal wrote:
What is the input voltage range of a stock TK70?

Stock TK70 takes 3-4D size batteries. Alkaleaks or Nimh

FMcamaroZ28
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Working Voltage: 4.8V – 8.0V
Max Input Current: 6.5A – 7A

From a quick google.

http://www.candlepowerforums.com/vb/showthread.php?317324-Fenix-TK-70&p=...

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FMcamaroZ28 wrote:
Working Voltage: 4.8V – 8.0V
Max Input Current: 6.5A – 7A

From a quick google.

http://www.candlepowerforums.com/vb/showthread.php?317324-Fenix-TK-70&p=...

I think my input current was less than 3A with the 3 lithiums. I can check later to verify. Dont hold me to that number just yet.

Ken

tatasal
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FMcamaroZ28 wrote:
Working Voltage: 4.8V – 8.0V
Max Input Current: 6.5A – 7A

From a quick google.

http://www.candlepowerforums.com/vb/showthread.php?317324-Fenix-TK-70&p=...

Thanks for your link.

The Thai TK70S version uses either 2 li-ion or the usual 4 nimh

http://www.thaipowerlight.com/Fenix-Flashlight/Fenix-TK70s

xed888
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tatasal wrote:
FMcamaroZ28 wrote:
Working Voltage: 4.8V – 8.0V
Max Input Current: 6.5A – 7A

From a quick google.

http://www.candlepowerforums.com/vb/showthread.php?317324-Fenix-TK-70&p=...

Thanks for your link.

The Thai TK70S version uses either 2 li-ion or the usual 4 nimh

http://www.thaipowerlight.com/Fenix-Flashlight/Fenix-TK70s

All TK70 can use 2 Li-ion cells. Not sure about 3 though.

tatasal
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xed888
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tatasal
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xed888 wrote:
tatasal wrote:
Two of either links will be good enough?

http://www.fasttech.com/products/1420/10002171/1156400-feilong-32600-37v...
(as long as the D cell)

http://www.fasttech.com/products/1420/10002175/1156800-feilong-32650-3-7...

Yup!

Have you tried this set-up or something similar? Aside from the weight savings, what are the other things that can be gained with such set-up?

xed888
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Shorter and better balance with a dummy cell near the head. I would prefer a 2D tube but cant find one.

Hyprmtr
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I just measured tailcap current with 3 fresh 26650s. It was 3.84A on high. It stayed at 3.84A for 30 seconds of run time. I suppose my driver is safe!

Ken

blueb8llz
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wow nice mod! can you tell me how many lumens now?

Hyprmtr
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blueb8llz wrote:
wow nice mod! can you tell me how many lumens now?

I can only really go by Matches test on the XML2 led on copper test. At 5100ma I would be at 4800 lumen. I like this light a lot because the reflectors are deep and it really throws well! I believe there is not a true way to convert lux to lumen?

Ken

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So you have the stock driver in and running at 12.6V?

And its not smoking?

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FMcamaroZ28 wrote:
So you have the stock driver in and running at 12.6V?

And its not smoking?

Thats correct! I even tried 4 cells. It didnt like it. The light would only shine dimly. This driver is very robust!

The only mod I did to the driver was bridge the sense resistors. Thats it!

I have about an hour run time on it with this mod too.
Ken

bdiddle
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Hyprmtr wrote:
I just measured tailcap current with 3 fresh 26650s. It was 3.84A on high. It stayed at 3.84A for 30 seconds of run time. I suppose my driver is safe!

Ken

The math doesn’t add up.

Input power is around 46 watts.
Output power at 5.75 amps per emitter == 5.75amp x 3.8(vf at 5.75A) x 3(emitters) = 65 watts.

Newb

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bdiddle wrote:
Hyprmtr wrote:
I just measured tailcap current with 3 fresh 26650s. It was 3.84A on high. It stayed at 3.84A for 30 seconds of run time. I suppose my driver is safe!

Ken

The math doesn’t add up.

Input power is around 46 watts.
Output power at 5.75 amps per emitter == 5.75amp x 3.8(vf at 5.75A) x 3(emitters) = 65 watts.

I didnt think to do the math. I am just measuring current in real time. I could have a fualty multimeter. Or maybe I’m not using heavy enough wire on my meter to test?

The 5.75A was a bench test with a Pb 12 volt battery. The assembled test was 5.1A at the emitters. The current test to the emitters was done at a different time when I did the tailcap current test. I do have another meter. I can try and test the output to the emitters and the tailcap at the same time. What efficiency are you using for the driver?

Ken

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bdiddle wrote:
Hyprmtr wrote:
I just measured tailcap current with 3 fresh 26650s. It was 3.84A on high. It stayed at 3.84A for 30 seconds of run time. I suppose my driver is safe!

Ken

The math doesn’t add up.

Input power is around 46 watts.
Output power at 5.75 amps per emitter == 5.75amp x 3.8(vf at 5.75A) x 3(emitters) = 65 watts.

I just did another tail cap current read. I used 10 gauge tin coated copper wire as short as I could I got a tail cap reading of 4.54A. That should be correct. I should be a little more thorough in my tests. I just get so excited to see such a gain in performance and I love to share my results. Thank you for allowing me correct my accuracy.

Ken

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