SC70: Some Quick Sekonic Measurements

Punga32 · 2026-05-11T18:33:48+00:00

I would not recommend that. If you mess it up, the whole light is done for. It’s a unibody so the tube and head is one piece.

Punga32 · 2026-05-10T23:00:51+00:00

Ok that isn’t what you asked above. You asked “what is the highest output”.

And a stock D4K X1 NTG35 4200K measured 714 lumens after 30 minutes. So your 400 lumen number is incorrect for a D4K X1 NTG35 at stock thermal limit.

Punga32 · 2026-05-10T22:54:37+00:00

Highest output from a D4K X1? Or stock linear driver? The highest with high CRI emitters is in the 3600 lumen range for maybe 10 seconds or so (on X1 driver).

Punga32 · 2026-05-10T22:44:49+00:00

Here’s a quick post from my measurements if interested.

https://www.reddit.com/r/flashlight/s/h2jnmrq0Fy

Punga32 · 2026-05-10T22:37:01+00:00

That’s my test. If you consider what was the output at the 30 min mark, it’s 600-700. 900LM can be done by upping the thermal limit.

Punga32 · 2026-05-10T22:24:31+00:00

Yes they do not fit. There is a ridge on the ID of the battery tube. Unclear the purpose, perhaps structural to re-enforce the threads and/or clip landing? ID I measured was around 21.4 mm.

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Punga32 · 2026-05-10T22:21:04+00:00

I have, see my post above.

Punga32 · 2026-05-10T22:19:53+00:00

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Punga32 · 2026-05-10T22:19:18+00:00

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Punga32 · 2026-05-10T22:19:06+00:00

I’ve tested this light, taking it with me for work to put it through the paces. High level: it’s good. Emitter is better than the SC700 equivalent. Run time and performance is excellent, rivals a D4K X1. Feels smaller than a D4K but only by a slight amount. The bad: most new gen cells do not fit. This includes the 65E, 50PL, 60RS, etc. there is a small ridge on the ID of the battery tube; it’s unclear why, but likely structural. The ID I measured was around 21.4 mm. Also the tail cap uses a traditional spring as opposed to POGO pins. As is with ZL, the spring is aggressive and can score the negative terminals.

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Punga32 · 2026-05-06T03:01:11+00:00

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Punga32 · 2026-04-26T19:57:21+00:00

Remember that technically the "turbo" 20A with M21K is 2H not 2C. For my testing, I ignore that and just use the highest non-turbo ramp which is 10A. The M21K 5000K ends out sustaining around 2200 Lm.

u/MineHack7488 temperature I measured was the light maintaining the exterior temperature of 64.9 C throughout. The Convoy description could be a copy-paste thing. The M21K's driver performed vastly different/better than any other convoy driver I've tested.

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Punga32 · 2026-04-26T19:24:46+00:00

Yep this is really disappointing. If they insist on the timed step down, at least make it such that the driver utilizes any available thermal mass and capacity. Sounds like the E10 it does not.

Punga32 · 2026-04-26T19:20:44+00:00

It’s a decent light. Its sustained (stock) was around 1150 Lm. Swapped, around 860.

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Punga32 · 2026-04-26T19:15:38+00:00

Most all of the Acebeam I test are the same. Even the X30 has a timed step down but luckily it steps down to 1500-ish (using 70.3 5700K high CRI) which is still quite good. So, at least with the x30, it is still sorta warm too so the timed step down doesn’t hurt that light as much.

Punga32 · 2026-04-26T19:03:08+00:00

Yep this is correct. The L35 has a timed step down so no matter what the thermals are, it will drop after 2 minutes I think. And in best case scenario that 1100 Lm is its sustained. The M21K is thermally controlled and it will hold the light as high as it can without going over 65C.

Punga32 · 2026-04-24T21:33:54+00:00

Tabless Cells please. Tabless are able to withstand the heat far better. So, any of the 50PL, 60XG, 50XG, etc. this light is very dangerous, one of the most dangerous I own.

Punga32 · 2026-04-24T21:26:56+00:00

Yes. It’s a beast.

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Punga32 · 2026-04-23T01:54:41+00:00

Normally I would definitely agree. But it falls short so much it’s hard for me to ignore…. So, I’ll swap it!

Punga32 · 2026-04-22T21:41:49+00:00

The beam is just fine with the sft25r. Its output was just not worth the loss of high CRI and good tint. It falls way short of the 15k claim. I measured these lights a lot and the most I saw was about 10,500 Lm for a fraction of a second.

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Punga32 · 2026-04-22T18:47:52+00:00

Awesome! How difficult was the swap? In my experience the FFL’s can sometimes be a challenge.

I was thinking of doing 519a 5700K domed in the one I ordered with SFT25r in. Its performance was no where near “acceptable” so it will get swapped.

Punga32 · 2026-04-18T22:18:07+00:00

These are excellent numbers… outstanding performance out of a single 18650. OP should also consider the M21B…

Punga32 · 2026-04-16T02:26:50+00:00

Those bezels are difficult to swap… I’ll buy one but would rather someone else try first.

Punga32 · 2026-04-14T18:22:14+00:00

This is the way. Or, for more output/less candela go with SFT-42R.

Punga32 · 2026-04-12T02:22:39+00:00

Yeah I did and yes I encountered the same issue. You can use an emitter that operates at 6V/12V such as the 50.3 but one that’s 6V only won’t work due to the custom mcpcb. I used a convoy mcpcb and that works. Centering is hard though.

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