Thinking about buying a Fenix tk75
and cutting it in half ..
I always wanted two tk 37.5 s
I suppose 17500s might work, but I was thinking of 4/5A NiMH. Once I measure it all, I will know more about what will fit, but definitely I will need shorter batteries, to have a heat sink and contact board, since the reflector is just about flush with where the stock driver is. Actually, the heat sink/contact board may all have to be in the body, so probably 4/5A or maybe even shorter like 2/3A. I will know more tomorrow.
:nerd_face:
but love the creativity…
I think this is a great project! A fat short thrower! I like it!
de-domed xpe2 @ 3 amps
me gusta.
actually, when i saw the thread title, I half expected to see a simple mod to 3*de-domed xpe2
then I saw the username 
I'm thinking, from what I see, that the LED, star, Heat sink, Driver and contact plate will have to be inside the body.
If I add all that up
- LED/Star - 3mm
- Heat sink - 15mm
- Driver - 8mm
- Contact plate - 4mm
So, I am looking at about 30mm. If I go with 65mm as the starting point, then it only leaves me with 35mm room for batteries. That's not a lot of room for batteries and it leaves me with my first thought (2/3A NiMHs). They are only 1600mA, but they are 10C batteries, so they will take high drain. 4 of them would work well for the XM-L2.
But..... if I go with a shorter stack up, the obvious thing is to cut back on the heat sink, go with 10mm thickness and make it a tight fit in the body, (no small chore when you think of the clover leaf opening in the body).
- LED/Star - 3mm
- Heat sink - 10mm
- Driver - 8mm
- Contact plate - 4mm
Gives me 25mm, so it leaves 40mm room for batteries. I can also get 5mm more if I use shorter springs, so that would give me a total of 45mm room. Now, let's look at what choices I have.
RCR123A - 17mm x 34.5mm not much power there 900mA max and that's asking a lot, but with 4 in parallel, it might work.
18350 - 18mm x 37mm at 1200mA and with 4 in Parallel it gives me plenty of power.
4/5A NiMH - 2000mA and I don't see the High C rating, so I assume not more than 2C. Still, it might be ok.
I am just showing you what I go through when I look for what battery configuration I am going to use on a light and of course I favor NiMHs. I usually use two sources for battery dimensions Wiki and Allbattery.
I am really tempted to go with the 2/3A NiMH due to the High C rate, but what do y'all think about it?
2/3 AA sounds good
the more heatsinking the better
Awesome, I’ve always wanted to see this done!
Hi OL,
I’m still new and I always have this idea to change my SRK to single emitter.
My suggestion is build another section between head and battery housing.
This to allow more room for your driver.
Great project.
OL, did you happen to test the reflector for its beam pattern with XML yet?
If it's this one: http://www.fasttech.com/product/1051800 it's pretty nice. I have one in a XML/3-D Mag.
edit: Oops, overlooked the dimensions in the first post, that's not it.
Got to admit the black SRK looks nice. With that big reflector it looks expensive. Black and chrome is always a nice combo.
The thing I wonder about is how much better it can be than a standard King. My King throws pretty dang good already but it isn’t a spotlight.
Do it, that is all.
My XinTD C8 V3 seems to throw slightly better than my SRK. It seems to get ~350m vs ~300m. The C8 has a ~40mm reflector (internal diameter), and the SRK has room for more like 48mm. So, I don’t really know what the result will be, but I wouldn’t be surprised to find out that this mod upgrades the throw from 300m to 400m or even 450m. It seems likely to be on par with a HD2010.
I use those reflectors in Maglites. It comes from CNQG. CNQG has one shallow and one deep. I have used them both many times. They will give a decent spot and basically they both throw. It’s more the diameter than the depth anyhow. It won’t be a super thrower pinpoint spot, but it will be more concentrated than a stock king. Of course, it won’t be as bright as a stock king, since it’s one led versus 3 leds, but that’s not the point anyhow. The point is just to be different, that’s all.
The OP is updated and I have a dilemma, which I have described in the OP.
I also ordered size A NiMHs from all-battery, so I am comitted to doing 4xA sized NiMH in series here.
Wait... how do you run a single 6v LED off two 105Cs?
An MT-G SRK would kick butt as an all-arounder! I don’t know if there are any tricks that will let you use one with AMC7135 drivers, though. You’d also need a boost driver if you’re committed to 4*NiMH, and a pretty BA one at that.