Fenix TK61 teardown and mod thread

The XP-G2 is an S2 2B, gas de-domed. The XM-L2 is a U2 1D heat de-domed. In each case the tint stayed quite nice.

dazed1, I'm a bit perplexed as well. I'm using the HX1175b1 driver to get that 7.2A (well, both numbers but with different resistors) I have a 40mm disc of copper .9mm thick under the 20mm Noctigon. Heat dispersal is near immediate into the head, you feel it and know it's working properly.

I do believe my reflector is off somehow. It seemed warped or something and would not center which is what led me to cut the entire bottom out of it to fit over a 20mm Noctigon. Check out this pic, the base of the reflector is clear...not touching anything at all. The reflector is held into the head by the lens and bezel and is snug. So why the obvious distortion to the left?

Hi

Its reflector seems out of focus in height…

How can you possibly tell the height positioning looking at a picture taken straight down on the emitter?

The focus is perfect at that height. 557.5Kcd with this XP-G2 you see.

It was adjusted actively, tuning in each direction past this point then back to what works best for this light. Meaning, while it was on, shining at a target 35 yards away, the height was adjusted to optimize the hot spot. And right where you see it is what works best. The chrome looking surface of the flat at the bottom of the reflector is approx 1mm above the star. The donut hole in the beam merges at about 1M when shining it at a wall.

I think, because he cannot see the yellow phosphor in the reflected image… bit it is just a guess on what he is looking at.

So I said “seems” :wink: If you corrected the focus is ok…just wanted to collaborate.

I thought it should look like that :

If I’d pulled the camera back to about 3’, or the focus point, it would look similar to that.

That picture was taken to show the reflector cut out to accept the 20mm star. And of course, is actually the Fenix TK61 that this thread is about. :wink:

Taken from almost 7’ above the light…

Take a picture at that distance, and it looks very similar to your photo sorry! :frowning:

Of course, is thread of Fenix TK61 :~

See how that warp in the outer edge of the lens remains consistent? I believe this is what is keeping this light from being far up into the 600Kcd territory.

Also notice how the reflector has an appearance like it’s Orange Peel? This is a smooth reflector. These are reasons why I dislike plastic reflectors.

I also think that it should be within that territory…. I think the poor finish of this reflector is the cause, you did something? try to clean it? does not look like std TK61 reflectors

No, I didn’t do anything to it, other than cut the bottom out.

Ordinarily if an aluminum reflector has ripples or lines in it I’ll hand polish it out. I’ve had great success with this. Again though, can’t do that with a plastic reflector. Beats me. I’m planning to search for a good reflector that will fit in here and see if I can get a better result.

Anybody know where a TK61 reflector can be found? Or one from another light that will fit this one?

Hi guys, did anyone measure,

Stock TK61, dedome only, current bump + dedome, how much cd does it increase with current, is it linear or at least close to it? based on this, it should be 1700 lumens or lets say 1650, does this means around 60% throw increase? thanks.

Vihn has some serious update with v2.0
I would like to see the driver he used. TK61vn V2 - Throw King +740K Lux ;-) | Candle Power Flashlight Forum)

Ill put my money on the HX-1175B from RMM (Not official yet).

It that is the case, its the driver I mentioned early in this thread a few months ago. ;)

(but with some tweaks that have cost RMM a ton of emitters to figure out)

Shut up and take my money.

a question:

why do you try to replace a p-channel transistor c01c by an n-channel transistor (70N02) ?
i mean it can not function as.

Different polarities, one triggers with pulling the gate (or base) to ground, the other applying a voltage

alot of reading…but hope that helps

Welcome to the forum phil76.

It was just a quick test I did for RMM.

Latest and greatest driver "mod" for the TK61 might end up being this.

Just an FYI- I’ve already corrected the issue tterev3 pointed out in the .sch, just need to fix the board (I added a gate resistor, series / limit resistor (or whatever the name for that would be) and BJT to facilitate the P-FET shutting down all the way.
This is high on my priority list but not at the top and I till I can secure a TK61 for testing I seem to be lacking motivation with all the other crap I have to do (hey I just posted the project 3 days ago, cut me some slack lol).

My TK61 arrived today. Batteries took a couple of hours to come up to 4.2.
For my short available range it lights up well. This weekend I’ll give it some distance over water.