Convoy S21A (Short Technical Review)

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Pakin
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Could anybody tell me the diameter of the battery tube? I want to buy one shockli 21700 4550 22a/30a for the s21a that is coming but I think it will be too thick.

Thank you

I will buy never more from Sofirn. Fake stock, fake tracking number, not trusty seller.

Terry Oregon
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I measured 21.48mm with my calipers.  I use Samsung INR21700-48G which fit just fine.

My reviews: , My personal collection of lights LINK,  J5 Tactical V1 Pro review LINK,  Thirteen Optical Sensors review LINKZebralight SC700d review LINK,  Ray-O-Vac Super Power Sportsman review LINK,  Convoy S2+ color combos LINK,  How To flash D4V2 LINK,  Convoy S21A LINK

Jerommel
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Nice it has a true Constant Current FET driver, but a shame a 10% mode was sacrificed for a moon mode.
In fact, it seems all Convoy drivers have sacrificed a necessary mode for a moon mode, ruining the mode spacing.

Pakin
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Terry Oregon wrote:

I measured 21.48mm with my calipers.  I use Samsung INR21700-48G which fit just fine.

Thank you Terry

Finally ordered 2 x LG21700 from Convoy.

I will buy never more from Sofirn. Fake stock, fake tracking number, not trusty seller.

Rayoui
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Jerommel wrote:
Nice it has a true Constant Current FET driver, but a shame a 10% mode was sacrificed for a moon mode. In fact, it seems all Convoy drivers have sacrificed a necessary mode for a moon mode, ruining the mode spacing.

Simon said that there will soon be a 17mm 5A constant current FET driver available with Biscotti.

Terry Oregon
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Rayoui wrote:
Jerommel wrote:
Nice it has a true Constant Current FET driver, but a shame a 10% mode was sacrificed for a moon mode. In fact, it seems all Convoy drivers have sacrificed a necessary mode for a moon mode, ruining the mode spacing.
Simon said that there will soon be a 17mm 5A constant current FET driver available with Biscotti.

Ah, now we're talking.

 

My reviews: , My personal collection of lights LINK,  J5 Tactical V1 Pro review LINK,  Thirteen Optical Sensors review LINKZebralight SC700d review LINK,  Ray-O-Vac Super Power Sportsman review LINK,  Convoy S2+ color combos LINK,  How To flash D4V2 LINK,  Convoy S21A LINK

manithree
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Finally got my first S21 from banggood this week. I don’t hate the 6500K as much as I thought I would, and I love this light. I EDC a Jaxman E2L, S2+, or BLF A6 in cargo pockets, and after a few days with the S21, it really doesn’t seem bigger for my carry purposes.

And the idea of a 5000mah 21700 with a full day of runtime makes me giggle as much as the throw of SBT90 in my new FT03S.

When there’s a version with a warmer tint and biscotti, I’m definitely getting another one of these. Ah, who am I kidding, I’ll probably buy more just like this when they go on sale again. Just an amazing deal for $17.

jericho0o
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Sent out for an astrolux s42 lens from BG, and cleaned out Kiriba-ru’s spacers – can’t wait to quad this up!

"And God said, 'Let there be light,' and there was light." - Gen. 1:3

BurningPlayd0h
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manithree wrote:
Finally got my first S21 from banggood this week. I don’t hate the 6500K as much as I thought I would, and I love this light. I EDC a Jaxman E2L, S2+, or BLF A6 in cargo pockets, and after a few days with the S21, it really doesn’t seem bigger for my carry purposes.

And the idea of a 5000mah 21700 with a full day of runtime makes me giggle as much as the throw of SBT90 in my new FT03S.

When there’s a version with a warmer tint and biscotti, I’m definitely getting another one of these. Ah, who am I kidding, I’ll probably buy more just like this when they go on sale again. Just an amazing deal for $17.

Guess what… there are S21s with 5000K SST-40 and “12 mode group” (clone of Biscotti) UI: https://www.aliexpress.com/item/33026858558.html?gps-id=pcStoreJustForYo...

You could probably also ask Simon to install and XP-L HI of your choice into the light as well. They match well with the driver, I swapped one into my S2+ with 5A/12 group driver and am enjoying it for a cheap beater light.

al_pnts
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Maybe i got a dud, mine is only marginally brighter than my 1050 lumin Thrunite TN4A. Awesome review, thank you.

Maglite 6C led, 6D xenon, XL50, AA xenon, Acebeam K65GT, Thrunite TN4A HI, Convoy S21A 5000k

BLF-L
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Hello guys, I have a question about Convoy’s 4-modes driver.
S11 with 4-modes driver, no strobe mode listed in the specification/description at AliExpress Convoy store, but some reviews on BLF mentioned it actually has strobe mode.
What about S21A ? Is it also 4-modes plus hidden strobe?

Simon Mao
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BLF-L wrote:
Hello guys, I have a question about Convoy’s 4-modes driver. S11 with 4-modes driver, no strobe mode listed in the specification/description at AliExpress Convoy store, but some reviews on BLF mentioned it actually has strobe mode. What about S21A ? Is it also 4-modes plus hidden strobe?

The S11 XHP50.2 driver manufacturer mistakenly added the double-click strobe function when producing a batch of drivers.
As a tool for daily use, I personally don’t like to add strobe to modes

BLF-L
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Simon Mao wrote:

The S11 XHP50.2 driver manufacturer mistakenly added the double-click strobe function when producing a batch of drivers.
As a tool for daily use, I personally don’t like to add strobe to modes

Hello Simon, thanks for your reply.
I actually like strobe mode as a hidden mode, not in the main loop, not something like “low-med-high-strobe.. “.
I prefer “hidden strobe”. But I think double-click is too short, has the potential of accidental activation.

Your new UI of M21C-U has three-clicks for strobe, I think that’s good. Is it possible to add this feature to other driver, especially your 12-groups driver? Additional mode, strobe, hidden, three-clicks. Accessible from any mode group.

I understand that 12-group driver has strobe mode in group 1, 4, 7 and 11, but that’s in the main loop, not hidden. Not ideal for EDC/daily use.

I think hidden strobe is an ideal solution for user who doesn’t like/need strobe as well as for user who likes/needs strobe. It’s hidden, not prone to accidental activation, but still relatively easy to access when needed.

Simon Mao
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BLF-L wrote:
Simon Mao wrote:

The S11 XHP50.2 driver manufacturer mistakenly added the double-click strobe function when producing a batch of drivers.
As a tool for daily use, I personally don’t like to add strobe to modes

Hello Simon, thanks for your reply.
I actually like strobe mode as a hidden mode, not in the main loop, not something like “low-med-high-strobe.. “.
I prefer “hidden strobe”. But I think double-click is too short, has the potential of accidental activation.

Your new UI of M21C-U has three-clicks for strobe, I think that’s good. Is it possible to add this feature to other driver, especially your 12-groups driver? Additional mode, strobe, hidden, three-clicks. Accessible from any mode group.

I understand that 12-group driver has strobe mode in group 1, 4, 7 and 11, but that’s in the main loop, not hidden. Not ideal for EDC/daily use.

I think hidden strobe is an ideal solution for user who doesn’t like/need strobe as well as for user who likes/needs strobe. It’s hidden, not prone to accidental activation, but still relatively easy to access when needed.

I have always wanted my driver manufacturer to write programs similar to crescendo, but I have been too busy recently. I think I will be free in a few days.

BLF-L
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Simon Mao wrote:

I have always wanted my driver manufacturer to write programs similar to crescendo, but I have been too busy recently. I think I will be free in a few days.

I don’t have experience with Crescendo but I read on BLF :
Crescendo has hidden strobe , and ramping, for flashlight with regular switch (not e-switch).

That’s pretty good!

stephenk
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BLF-L wrote:
Simon Mao wrote:

The S11 XHP50.2 driver manufacturer mistakenly added the double-click strobe function when producing a batch of drivers.
As a tool for daily use, I personally don’t like to add strobe to modes

Hello Simon, thanks for your reply.
I actually like strobe mode as a hidden mode, not in the main loop, not something like “low-med-high-strobe.. “.
I prefer “hidden strobe”. But I think double-click is too short, has the potential of accidental activation.

Your new UI of M21C-U has three-clicks for strobe, I think that’s good. Is it possible to add this feature to other driver, especially your 12-groups driver? Additional mode, strobe, hidden, three-clicks. Accessible from any mode group.

I understand that 12-group driver has strobe mode in group 1, 4, 7 and 11, but that’s in the main loop, not hidden. Not ideal for EDC/daily use.

I think hidden strobe is an ideal solution for user who doesn’t like/need strobe as well as for user who likes/needs strobe. It’s hidden, not prone to accidental activation, but still relatively easy to access when needed.


Light painting photographers like strobes (single frequency strobes). They can be hidden as long as once selected they can be memorised! It is quite a big market, one light painter has over 300k followers on insta.
BLF-L
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I just did a little more reading about Crescendo. It’s very good!
Simon, if you make Crescendo driver available for S21A and S21B that will be great.

stephenk
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BLF-L wrote:
I just did a little more reading about Crescendo. It’s very good!
Simon, if you make Crescendo driver available for S21A and S21B that will be great.

There are no discreet brightness steps in Crescendo. As an optional UI, yes, but I would hope not the only UI available.
BLF-L
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stephenk wrote:
BLF-L wrote:
I just did a little more reading about Crescendo. It’s very good! Simon, if you make Crescendo driver available for S21A and S21B that will be great.
There are no discreet brightness steps in Crescendo. As an optional UI, yes, but I would hope not the only UI available.

Yup, as an optional UI.
the Biscotti (12-group) is also very good.
It’s good to have options. People can choose what suitable to their need/desire.

abgx1
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seems like spring bypass is not very high quality, after short time it just ripped off on all 3 s21a which I had

I guess its because of low quaility insulation on that cable used for bypass, which will become just too stiff(plastic like, instead of rubber…) due to heat damage

ZoomieFan
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If I look at the runtime graphs then it looks like the light no longer steps down around 630 lumen, ~35%

So my ideal would be something like:
- 35%, 15%, 1%
- hidden turbo, 35%, 15%, 1%

Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88 4/5, LiitoKala: 3x100 3/5, 2x202 3/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k 2/5, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5, Xtar PB2S 5/5
Waiting for: (DQG Tiny) 21700 EDCs.

jeff51
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Just got an S21a today from the sale mohrlumens.com was having. Nice to be able to buy from a US source now that Mountain seems to be not selling lights like they used to. Came in the standard mail pouch. Hand written note inside telling me some extra parts I ordered were hidden inside the light for protection during shipment.

I got the 5000K version. The UI is fine. I’d rather have steps than a ramp in most hand held lights. I’ve got mine set for .1%, 1%, 10%, 50%, plus the blinkies. No memory, so it always starts in lowest mode. This is setting 7 if I recall correctly.
The strobe is very attention getting and I like the bike mode. Both of which I will probably never use.
I haven’t gotten a chance to put it to the oscilloscope or the lumen tube yet.

I like the beam pattern. I wish the spill was a little wider. There is some ringing at the very edge.
White wall hunting, I find the S21a to be noticeably warmer than the Samsung LEDs in the SP36.

The rear spring has a bypass. The front spring does not.

Fits the hand really well. Got a holster/pouch along with the light. The holster is really stout and seems really well made.
Unfortunately it doesn’t fit! The flap is way too short to close on the S21a. It’s also too short to close on a S2+.
Oh Well….

A little too big for a EDC pocket light (as are most). But for a coat pocket or a bag light? Just right. I like the extra run time the 21700 gives.

I’ll take a look at the PWM of this driver sometime soon.
For $18 plus shipping? Can’t go wrong. Got the stuff during the 15% off sale.
By the way, shipping for the light, two other S21a bodies, and a driver was $8.59 (I think).
All the Best,
Jeff

ZoomieFan
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I agree, while the size is good for the cell size, it’s not ideal.
I agree with this thread’s OP: http://budgetlightforum.com/node/73012

3% (82lm) – Indoor use and simple outdoor walk.
30% (692lm) – Excessive for indoor use. Often not needed for regular outdoor needs.

When I buy another light, I look for advantages over my current lights that I actually use.
For me that’s:
- Tool 2.0 AA. I have this one in my pocket 95% of the time. Even during daytime.
- DQG Tiny III 26650. Certain walks. Work light.

Obviously a 21700 packs a lot more power than the AA/14500 that powers the Tool. So at equal lumen, the Convoy has far better runtimes.

But do I really need that? No. A runtime of >240 minutes is good in my book.

Tool with 14500 gives me 360 minutes runtime at 85 lumens.
For me that means I don’t need the Convoy for “Indoor use and simple outdoor walk.”

Tool with a 14500, at its peak matches the Convoy’s 30% @ 650 lumen.
The 33 min runtime is way to low.
Swapping cells every 2 or even 1 hour would be acceptable. But not half an hour.
So that’s where the Convoy clearly has the edge.

I mostly use my lights for looking for stuff, for not tripping in the dark.
I do forest walks, but they are mostly “simple walks”, because rarely I need to see far away.
So even then 85lm suits my needs, with perhaps a brief high/turbo, using a 14500 cell.

Using an AA in the tool would give me:
360 mins at 85lm.
150 mins at 140lm. (requires a spare cell)

So…. do I really need it? No.
It’s so cheap I might try it anyway.
Because I don’t like stepdowns and 500-600lm is the turbo sweetspot for me, what really holds me back is the mode spacing.
Something like 3%, 15%, 50%, optionally hidden 100%, would make my choice much easier.
I fully get it, to suit everyone’s needs a light would need 500 mode groups.
That’s why ZebraLight’s approach is nice. 4 modes which each can be selected from a total of 16 (I think) values.

EDIT
I hope like the S2+ there will be options on how many drivers the light has. That would at least take away part of my reservations.
7135*3 output current 1050mA
7135*4 output current 1400mA
7135*6 output current 2100mA
7135*8 output current 2800mA

Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88 4/5, LiitoKala: 3x100 3/5, 2x202 3/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k 2/5, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5, Xtar PB2S 5/5
Waiting for: (DQG Tiny) 21700 EDCs.

LOG20
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Recently picked up one of these with the 12 mode grouping.

Seems that whatever mode I choose it will at some point in the future randomly reset to the first mode (ie. 0.1 , 1…blinkies etc)

I recall there being something about driver memory wearing out if left in config mode for too long (which i haven’t) but it makes me wonder if this is an inherent bug with the driver, or do i simply have a buggy item.

Any ideas would be welcome. Thanks.

Simon Mao
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LOG20 wrote:
Recently picked up one of these with the 12 mode grouping.

Seems that whatever mode I choose it will at some point in the future randomly reset to the first mode (ie. 0.1 , 1…blinkies etc)

I recall there being something about driver memory wearing out if left in config mode for too long (which i haven’t) but it makes me wonder if this is an inherent bug with the driver, or do i simply have a buggy item.

Any ideas would be welcome. Thanks.

pls contact me any time if there is problem with the driver ,my friend

g_damian
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LOG20 wrote:
Recently picked up one of these with the 12 mode grouping.

Seems that whatever mode I choose it will at some point in the future randomly reset to the first mode (ie. 0.1 , 1…blinkies etc)

I recall there being something about driver memory wearing out if left in config mode for too long (which i haven’t) but it makes me wonder if this is an inherent bug with the driver, or do i simply have a buggy item.

Any ideas would be welcome. Thanks.

Check https://budgetlightforum.com/node/74851

Simon Mao
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At present, the manufacturer has replied. This is because the mode group is not saved at the moment of power failure. At present, the manufacturer has fixed this bug by modifying the program.
If some users need me to mail a new driver after one month, please leave me a message,

Serlite
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Odd, the S21A has been on the market for a while, but I feel like I’ve only started reading about these memory bugs in the past couple months.
Was the manufacturing process changed at some point recently? I’ve got one in the mail, so fingers crossed that it doesn’t exhibit similar bugs…

LOG20
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Are you sure it’s power failure? The mode memory on mine has never been affected by opening the flashlight. It will just randomly reset at some point in the future. There does not seem to be any particular cause.

abgx1
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same for me, once per like month it will simply change mode group for 1st one

I dont know what cause it, as it happen very rarely

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