Substained output single cell light

Hi,
I have the sorfin sc31 pro for about 2 years. I am quite happy with it but there is one problem, the output is just about 10% when the battery is at 3,2v (sony vtc6). This is due to the step down driver.

So now I am looking for a new light with these reqierments.

- 18650 or 21700 battery (not to big)

  • Boost driver for substained Output. I need about 1500 lumens even with an almost empty battery, but just for a short time (2min).
    -at least 2000 lumens turbo, better would be 4000. I know it is not possible to substain such an output for to long due to thermal throttling.
    -stepless ramping, I really like the anduril but any other good user interface will work just fine.
    -usb c charging would be nice to have but no must.

I did some research and found the sorfin sp33 V3 wich would fit really well except for it’s size.

Do you have any suggestions?

https://eu.nkon.nl/zaklampen/brands/zebralight-flashlights/zebralight-sc700d.html

3.2v is “empty” unless you want to run moonlight for a while. If you want turbo you need to start recharging at 3.5 or 3.6v.

agree

Good Advice! :+1:

Convoy M3-C. I’ve used level 4 (turbo equivalent)down to 3.4 volt. Ramping is not as good as Anduril.

Now I did a even more research and found the wurkkos ts22.
In my opinion a good cell like the Samsung t40 can deliver 5a at 3.2v. The battery will drop under load to 3.0v but this is still 15w wich is equivalent to 1500lm.
Does this light have an output of about 1500lm at 3,4v when the light is about 20°c?
How is the general experience with this light?

Interesting that you recommend that light pennzy; I have a Convoy M3 (the non-charging version) and find I can only access turbo when my battery is brand new. Even if I’ve used it for only a little bit and I select turbo mode it will drop out within a few seconds due to low voltage (annoyingly dropping back to moonlight, instead of high which makes so much more sense).

At first I thought I just bought a junk battery for it but I checked the review of my cell on lygte-info.dk and the cell should be fine.

Saying that, on high mode the M3 puts out ~1500 lumens and can output that for a constant 2.5 hours (according to 1-lumens review) so is not a bad choice if turbo isn’t always needed.

I think the m3-c addressed that.

This is weird, I don’t see any noticable step-down on either my M3 or M3-C until the battery has been significantly depleted. Mine are both equipped with 26800 cells and both have XHP 70.2 emitters in 5000k

Hmmm good to know, maybe I need to take a look at mine and see if there’s anything obvoius with it that was cause this lack of performance.

What 26800 cells are you using? (Maybe my cell is the issue?)

M3 and M3-C are great lights but at 290 grams and 26650/26800 a touch bigger than OP requested. This light needs 11 amps on high for the top end. Many high capacity 26650 start to sag a little, could be the issue. 26800 QB listed at 6800mah got this rating at a 10 amp drain. This battery does 20 amps just fine so may not sag as bad. The 26800 Vapcell is listed at 6200 mah, but I got 6595 and 6622 on my two cells at a 1 amp drain. This cell is rated for 25 amps. Still off a bit from original post but the M3-C 26800 light is one of the very best.

I think the convoy m3 is a great light but a bit to big for me. And a can’t machine it smaller because of the big drive.
I am planning on using a Samsung 40t wich has a low cell impedance so it can output a good amount of current even at low voltage.
The three lights I am sinking about are these:
Sorfin sp33s
Wurkkos ts22
Pioneman k36

Wich of those lights have a boost drive and high output at low battery voltage?
Wich one do you generally recommend?

Good info, thanks - maybe my Efest 5000mAh 26650 is to blame.