[Review] Convoy S12 ( 3 x SST-20 / 219C, 21700 ) - Output, Power and Thermal Regulation Tests!

Any suggestion if a pencil trick will work on which cap to remove mode memory on this driver?

Is this the same switch as on the S11?

EDIT: Is this mod possible on the M3?

2541 Lumen yes!! Within my range expectation. This was 4000k, not to mention 5000k, I sure they will be happy to hear it. Still awaiting S12 to arrived…

Apart from brightness, the current regulation seem to be pretty well hand. Constantly slow as can been seen amp/v graph. Good efficiency.

Next thing I want hear is how much can it throw. I been known SST20 for it throwish, but I really expect it to flood though due to its triple led. Can it handle mid throw range?

Awesom light from convoy anyway! Well craftmanship and I devote it sexy body :heart_eyes:

Yes, i remember someone else asking it, who i helped. there are instructions on blf, only don’t remember which thread

How is 2500 lumens possible with 3x SST-20 4000K 95CRI if tests have shown a single emitter does around 537 lumens @ 2A? According to those tests this light should do about 1500-1600 lumens @ 6A.

I have a Jaxman E2L with 3x SST-20 3000K 95CRI and a LD-B4 driver set to 6A max current. The 3000K LED’s emits around 1350 lumens with a Carclo 10511 optic installed.

Thanks for the review. I am waiting it from long time. Looks like this is perfect bike flashlight.
Found on youtube:

Convoy S12 (3x SST20-4000k) vs Convoy S2+ (SST40 5000k)

Astrolux S41S 4x219B vs Convoy S12 3xSST20 4000k

Thanks for the review mate.

These are the 90+ CRI LEDs?

Output seems a bit high for 6amps i would expect like 1600-1800 lumens max. Still great efficiency high output high CRI light.

How a 18650 battery is fitted (if it can be fitted)?

Well, it seem pretty much high indeed for 6amp driver. Don’t know how to say. But he seem to use Imalent 21700 battery :expressionless: I’m not really sure if that relate with higher lumen.

Probably it should be around 1800ish lumen, it been mention before…

You can use a battery that can supply 30A, it won’t make a difference. This is a regulated driver from Convoy. I have a few, and I’ve never seen them pull more than 6A. There’s something wrong with his measurements.

My FW3C also has the SST-20 3000K from BlueSwordM group buy and on turbo it obviously runs full FET and it draws 14.1A (4.7A per LED) on turbo with a fresh 30Q cell. Not even that light does 2500 lumens. I measured around 2130 lumens.

If not battery, how about this one he mention…possible make a different? I still doubt though. Unlike other reflector which is using aluminium part. Or else he could possibly wrong.3

Guys now that I am looking at the output numbers,they indeed seem a bit high.

I am speculating that I might have forgotten to adjust the final numbers using the correction factor I use in all of my tests :slight_smile:
I will take another set of measurements and report back tomorrow night!

Hello bilakos10,
Thanks for the review.
Do you have any beam shots of S12 and comparison with other Convoy lights ?

Great review man, thank you. I got the Nichia version @ 4k, warmer than what I’m used to but am getting used to it. Beautiful beam quality and a good looking light too. I like the idea of the simple 4 speed UI but for my applications I need another gear a 3.5 or medium high up around 60% (mode 3 is only 30%) especially for lean hot rods like this that might quickly need turbo relief. Brings up another thing, my model does not seem to step down at all and will keep turbo going until I cry uncle and turn it down (or put it down). I don’t mind that though and the tail switch is stiff and well protected. Might be a fire hazard with a side switch light. Anyway I like it, it’s a keeper. Unlike my M4U which despite a better UI (but still with the 4 speed problem) is way too weak for my hand to gravitate towards it at walk time. So many better compact combo/throwers at similar value.

@Tangra have you tried this light? Is spot large enough and spill soft?
Will Nichia 219C have similar output as SST20?
If I’m calculating correctly this one has about 140lm/W, it’s far more then XHP50.2 inside KDIY KF8 (108)…

I feel flattered when someone posts videos I made. Thanks for posting them. :slight_smile:

In my beamshot comparison, my guesstimated lumens (Convoy S12 with 3x SST20-4000k) is somewhere around 1300+ lumens, definitely not more than 1500 lumens.
*guesstimated = based on comparison with flashlights that indicate lumens values (but I don’t have a way to directly test lumens either…)

I’m getting just around 5.5+ Amps on the tail current (using Liitokala Lii-40A 4000mAh 21700 battery, Those are the ones I used in the above video)

another comment on the 21700 body tube:
The Convoy S21A, M21A, M21B, L21A, (these 4 flashlights use 21700) body tube will not accept the slightly thicker Lii-40A 21700 battery, but the S12 body tube is a bit bigger and accepts the slightly thicker Lii-40A 21700 battery.

I was about to order S12, but on 30% level output S12 is lower then S21A at same mode.
According this review Convoy S21A (Short Technical Review) S21A has 683 lumens at 30. S21 estimated has 500 lumens at 30.

@bilakos10, could you do some measurements? I need bezel depth from edge to pcb support plate and locking ring height and smaller internal diameter.

i’m interested at the runtime in medium?
i’m a complete noob, so can i just divide the ampere power of the battery (18650/15A) through the 1700mA and then ending in a running time of about 1.5 hours?



Yes, calculating the runtime of a fully regulated mode (high, medium, low) just requires to divide the battery's capacity by the current draw.
Let's assume we got a 4500mAh cell.

Runtime (High) = 4500 / 1730 = 2.6 Hours
Runtime (Medium) = 4500 / 140 = 32 Hours
Runtime (Low) = 4500 / 9 = 500 Hours