Sofirn SC31 PRO, New Anduril Flashlight

Mine fits perfectly as shown in my post #101.

My SP40 short tube’s threads fit like clockwork. But as mentioned, the springs on both ends are compressed about as “tight” as any light I’ve cranked down. If you were going to keep it an 18350 shorty it’s whole life I think it would work fine though. But the springs might get pretty flat after a while :smiley:

Does the SC31 PRO have a FET + 1 driver?

Can somebody test if battery check and charging functions work correctly?

Battery check of my SC31 Pro shows 4.5V and still charging the 35E cell…

Mine indicated 4.2V whereas the battery’s actual resting voltage was 4.05V. It would be nice if Andúril had some feature to calibrate the voltage measurement.

Some beamshots I took yesterday night. The white house is about 120m far away.

Sofirn SC31 Pro (Luminus SST40 6.500K 70CRI) 2.000lm

Wurkkos FC11 (Samsung LH351D 5.000K 90CRI) 1.300lm

Thanks Lux-Perpetua! Probably it is Ok that the battery check indicates higher charge than the actual one. Hopefully the built-in charger does not overcharge the cell.

Can you please try to immediately measure the battery‘s resting voltage with a(nother) voltmeter? If it’s really overcharged way above 4.25V it seems to be a severe problem that deserves further investigation. Thanks for letting us know about it.

The charger is a separate circuit and should be fine.

Btw, I added voltage cal to Anduril, but only to the 2019 version. TK changed the voltage reading quite a bit since, so it would take a little time to port. After years of frustratingly voltage cal'ing each individual mod light for Narsil, finally built it in to Anduril.

I got Anduril working like Narsil: 3C to voltage, 2C next to temp, 2C next to version #. When you are in voltage reaging mode, 4 clicks to calibration.

The problem is that I don’t have a voltmeter :slight_smile: Need to get one. Therefore I am asking if someone else tested this.
I have a LiitoKala Lii-100 charger, and it is also still charging the cell, indicating that it is not yet fully charged. So most probably it is fine.

Right, anyway an offset of 0.3V is substantial and renders the voltage check feature useless. I wonder what technical issues cause such discrepancies. I suppose this is not a Sofirn-specific problem but more likely a correlation between a certain driver component and Andúril.

Maybe this could be a worthwhile feature to incorporate into Andúril 2.0? I talked to Sofirn about the importance of an accurate thermal calibration today. As it’s probably a PITA for any manufacturer to do the factory calibration for each single flashlight, it will need to be highlighted much more in a „Getting Started“ section of the manual. Adding a voltage calibration would fit into this section seemlessly.

Did some research on this. Best as I can tell without pulling the driver, it's a FET+1, based on:

  • no 7135's on the underside of the driver
  • if there was a bank of 7135's, they would have to put them on the vertical board where the USB charging is - doubt there's enough space
  • I can clearly see a slight flicker at about 0.35 amps, coinciding with the 7135. Ramping up to the default ramp top of 3.85 amps, I can't see any other flicker in that range, and if 3.85 amps was the top of the bank, there would have to be 11 7135's in the bank - very much doubt enough space.

Btw, the bezel is glued with blue stuff, probably Loctite. I got it open with sticky blue gloves, but was a little tough, not too bad.

Using a very good VTC5D cell, with the SST-40 6500K: 7.9 amps at the tail, 2240 lumens at start, 2070 lumens at 15 secs, 19 kcd (276 meters). The springs don't look like anything special - bypasses would probably get a bump.

I'll probably at least attempt to remove and get a good look at the driver.

Noticed some odd readings from mine as well. 4.3 when its 4.14 (right after charging)
One time it blinked out 3.3 first then 3.8(actual), even the temp check will go up a couple c after first check.

Checked charging voltage on mine.

Charge terminated at 4.2 blinks indicated by the light.
Digital multimeter showed 4.14 volts.

I checked the voltage offset on mine once again. After charging the Sofirn battery in my Nitecore UMS-2 it has a resting voltage of 4.16V. Once inserted into the SC31 Pro it blinked out 4.3V. That’s an offset of at least 0.14V (potentially up to 0.23V).

On TLF some people noticed sharp edges on the heat fins as well as a foggy glas lens. I can confirm both on my sample, too. However, it is not as severe as on some previous models in the past (SC31B, SP33 V2).

I can confirm the Pro is FET+1. It follows the design of the SP36, as they claim they are running the same exact Anduril version as for the SP36.

I pulled the driver. Weak glue holds it in place. 4 wires to the side switch. Used a solder pick to push down on the driver thru the LED+ wire hole, no hammering, just pressure - didn't damage anything. The driver has Chinese lettering on it, based on the SP36 design.

Think mine reads voltage high as well. Sounds like all the differences reported read high.

The charger in the SC31B that I gave away was a little weird too. The light turned green at about 4.something but it continued charging for what seemed like forever. Finally it stopped charging(I was watching it on a USB tester) at about 4.17 volts. It didn’t overcharge but it also didn’t stop when the light turned green either.

Thank you very much Tom!!! :+1: :slight_smile:

Thank you very much Tom :+1:
did you take any picture of the disassembly ?