I’m usually anti-memory but works well with this one. From off - press and hold for moon light, dbl click for turbo or single click for last used mode.
Two concerns - 1) I haven’t tested runtime but the battery seems to run out quick - parasitic drain?
2) The magnet is WEAK! Torches similar size in rank of magnet strength:
uTorch S1 mini 16340 strongest
Eagle Eye X1R 18350 middle
OnTheRoad M3 Pro 16340 middle
Sofirn SC21 16340 weakest
That’s pretty lame. I hate a weak magnet on a flashlight. I want to hear that clack when i throw it on rebar.
Yup. D4S [CLANG] E12R [BANG] E07x [KAPOW] PL47G2 [PLONK] SC21 [PFFT]
I had the M3 Pro stuck to the vertical metal stem of my bedside light. It’s been hanging there since christmas. Stuck the SC21 below the M3 and it had slid down by morning. Sad.
D4S is my gold standard for tail magnets. Are you saying the E07 is stronger? I don’t have one of those. Yet.
Holy Thread Irrelevance, Batman!
Back to the magnets, which is really a bit of a tangent, between old D4S and E07x magnet it’s too close to call by hand.
test
EDIT:
Yep, I can post in this thread, but Jimo cannot. 
Damn. I just tried, and I can’t post anything here.
He's back! 
I’m guessing irrelevant posts promoting personal sales are against the rules for the forum…
Yep, I mark them as SPAM. 
Since magnets are mentioned, I’ll also confirm that the D4S/D4Sv2 tail magnet is really strong.
I don’t have an E07X, but have the earlier E07, which doesn’t have a magnet.
The PL47 tail magnets are mixed - since I ordered one each of different LED type, I noticed some of them are “OK”, but have one that is extremely weak (cannot hold the flashlight sideways even without battery).
I would like to mention the Wuben TO50R-HC, which also has a very strong magnet on the tailcap - I would dare say almost as strong as the Emisar D4S/D4Sv2 tail magnet.
how strong do u need those magnets to be ? if its enough to hold the light thats good enough.
I think usually something a bit stronger to hold the light more steadily.
I’ve noted some lights magnet can hold the light (on the side) IF the flashlight is not touched or moved. A slight touch could make the flashlight fall off.
A bit stronger magnet will make the light more steady and resist from falling if there’s a slight movement…
Has anyone managed to swap out the LED in the SC21 yet?
I want to put an Osram CSLNM1 in it, make a tiny lil thrower
It fits some standard optics that fit in the SC31PRO/B like the Carclo ones but it is physically slighter smaller in the overall diameter. It might need a little filing on a 16mm but it might fit. I will either swap the LED itself or see if a 16mm board will fit. It’s 3535 so there are a lot of options. Bezel didn’t have any glue or anything. I swapped a SC31PRO with a CSLNM1.FY and it’s a fun light but the outer portions have some rings with an smo reflector.
I’ve successfully swapped a KW CSLNM1.TG in.
A bit of filing was needed for the screw near the (-) wire, and wouldn’t be needed at all with a different MCPCB.
Samsung
Osram
Any recommendations for a SMO reflector?
Overall, I am pretty much impressed by the stable constant current regulation. They could tweak it a little bit for a constant temperature level of 45°C, allowing a little bit more regulated output.
thanks for the runtime chart
looks like about 900 lumen turbo for 3 minutes, then step down to sustained 240 lumens for over an hour… excellent!
fwiw, I find that setting a lower thermal ceiling (on my FWAA), increases the sustained lumens
iow, set to 40C, the light might sustain 300 lumens, instead of 240
I think this is because once internal temp triggers the 45C thermal ceiling, the light drops to a lower sustained output, due to the extra heat remaining inside the host.
Have had an SC21 (vapcell 850mah capacity) for about three weeks now and running it alongside my Wurkkos FC11 (vapcell 18350 with 1100mah capacity) during my nightly walks. In my personal use, I end up with the difference in battery capacity being a non-issue. On moonlight and low, either will last for days. I primarily use medium (100 lumens) on the SC21 and reliably get more than four hours. The 50 lumen low on the FC11 lacks the punch of the 100 lumen medium on the SC21, so I have to use medium on the FC11 (300 lumens) as well. My experience (not scientific testing) is that the SC21 provides about an hour more of runtime on medium, than the FC11 on medium. Either easily are sufficient for my two hour walks.
Note that I did not compare on high or turbo because if I need that much output, I will just use the FC11 with the 18650 battery tube.
Aaaw, heck. Bought one of these to growing collection!