[Review] Convoy L21A w/ KW.CULPM1.TG | We got a new throw king ! | Beamshots, Thermals and Output

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bilakos10
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[Review] Convoy L21A w/ KW.CULPM1.TG | We got a new throw king ! | Beamshots, Thermals and Output

The flashlight was sent to me by Convoy for review.
Here's the product's link: Convoy L21A 



The flashlight comes in a regular cardboard box and is seated into foam.



The L21A comes in black matte anodization. The finish is excellent along the flashlight.



The body contains light knurling, while the design of the head and tail provide anti-roll. 



The head of the flashlight is quite big and integrates some thick heatsinking grooves.
Since this specific variant is rated for 8A+ of current, the extra heatsinking is definitely welcome.



A large bezel is placed in the front part of the head to protect the AR coated glass lens.



Of course, being a dedicated thrower, this variant of the L21A uses a smooth reflector.
The OSRAM KW CULPM1.TG emitter is perfectly centered via a plastic gasket.



Of course, the head can be easily taken apart by untwisting the bezel.



The emitter is placed in a copper mcpcb.
As seen, plenty of thermal paste is used to ensure a good thermal path.



The driver is secured in place via a metal retainer ring.
The manufacturer has used a cylindrical brass piece as the positive terminal in order to achieve as least resistance as possible.



The L21A uses a reverse-clickie mechanical switch.
The switch sits below the two rear metal flaps, which allows the flashlight to tailstand.



The switch comes bypassed from the factory in order to decrease the overall resistance.



Here's the rear assembly taken apart



The rear threads are square cut and anodized.
This allows the flashlight to be mechanically locked out.



The head's threads are also square cut.
As always, the threads are very cleanly machined.



And as an added bonus, here's a pic of the L21A alongside the L2.



User Interface
The Convoy L21A  runs on Biscotti firmware.
Here's a picture that demonstrates the available modes and actions.
Αποτέλεσμα εικόνας για convoy biscotti

Note: In order to prevent accidentally entering configuration mode, the required taps to enter the respective mode has been increased to 20.

Performance
Here's the output measurements I recorded along with the respective current draw while using the 5th mode (1%, 20%, 100%)

  

As you can see, the L21A pushes 1481 lumens while drawing 8A+.
The numbers are quite impressive, as the flashlight has been setup to push the KW CULPM1.TG to its limits.

Thermal Regulation

And here's a thermal regulation chart for Turbo.



What I observed while conducting the thermal regulation:

  • The driver is constantly regulating the output in order to keep the temperature below a threshold.
  • At around 15 minutes, the flashlight's temperature and output stabilizes at around 850 lumens.
  • The flashlight's temperature never got too hot.

I shall say that I'm really impressed that the flashlight was able to maintain > 1000 lumen for such a long period.


Beamshots
Here's some outdoor beamshots demonstrating the excellent throw of the flashlight.

 
 

Convoy has nailed it again sealed
I think it wouldn't be an exaggeration to say that the Convoy L21A w/ Osram KW.CULPM1.TG is the most throwie flashlight you can buy at this price range.
And as always, the flashlight's quality is excellent all around.

P.S Tomorrow I will also be posting my thermal regulation charts.

Edited by: bilakos10 on 01/26/2021 - 14:57
Yokiamy
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I can only confirm all positive thoughts about this light, this one’s a winner.

Pilotboy
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Yokiamy wrote:
I can only confirm all positive thoughts about this light, this one’s a winner.

I agree, this flashlight is simply amazing!
Chicken Drumstick
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I have one of these on the way.

Do you have any cd figures? I saw an article claiming something like 374,000cd. Which is a lot. But the Noctigon K1 claims something like 600,000cd from essentially the same setup.

Yokiamy
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The K1 is driven a bit harder and has a slightly larger reflector.
Not sure about exact numbers from the K1.
The convoy is more basic, but built like a tank.
It has a bit lower numbers as the K1

https://budgetlightforum.com/comment/1718732#comment-1718732

bilakos10
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Chicken Drumstick wrote:
I have one of these on the way.

Do you have any cd figures? I saw an article claiming something like 374,000cd. Which is a lot. But the Noctigon K1 claims something like 600,000cd from essentially the same setup.

I don’t have the K1, but since both flashlights share a similar form factor, I’d say the K1’s numbers sound a bit bloated.

G0OSE
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Looks impressive for sure! Thumbs Up

nightfog
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How would that compare with M21C (with the same LED)?

Convoy M21C

Rusty Joe
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Problem with this light is no momentary-on for distance spotting/playing!

ArtieT59
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I can atest that this L21a woth CULPM1 is an amazing thrower, beautifully machined, built like a tank, and really handles the heat from the osram well. Just last night I was spotting deer with it and kept it on turbo for awhile (over 2 minutes) and didn’t notice the heat in the head. I’ll be interested to see your thermal measurements!

I would recommend this light to anyone looking for a great thrower in this mid size range light for a great price! I can’t say enough about it

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nightfog
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Buying it from AE and shipped to the UK, it comes up to £40.80 (about 56$), including the now automatically added tax, in this case, of £6.80 (tax started being added since 31.12.2020).
I certainly felt that tax on my recently bought Sofirn TK70, which rose the final price from £41 to £49.
Is there maybe a better place to buy it from?

Yokiamy
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You can ask Simon for a BLF discount, which is 15% I believe.
Other sources are equally priced, and might need additional shipping fees.

bilakos10
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Here's my thermal regulation chart for Turbo



What I observed while conducting the thermal regulation:

  • The driver is constantly regulating the output in order to keep the temperature below a threshold.
  • At around 15 minutes, the flashlight's temperature and output stabilizes at around 850 lumens.
  • The flashlight's temperature never got too hot. 

I shall say that I'm really impressed that the flashlight was able to maintain > 1000 lumen for such a long period.

ArtieT59
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This is what I had thought You may find, amazing!

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Check out some of my new lights (picture heavy) and quick first impressions of them here: https://budgetlightforum.com/node/77180

My Sft40 beamshots / comparison thread: https://budgetlightforum.com/node/78100

Geuzzz
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Thanks for letting me buy another thrower I don’t use in the city Wink

bilakos10
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Geuzzz wrote:
Thanks for letting me buy another thrower I don't use in the city ;)


Hehe laughing
I am also in the same situation. I love owning throw monsters, although I rarely get to utilize their full potential in the urban environment.
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I feel for you city slickers. I don’t even like full moon nights. Big Smile

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ive got a few of these leds coming and will be making a few mods to my flashlights

got 1 coming on a 16mm pcb for a aa tool

and a few 20mm boards for some c8 convoys

loverly jubley

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SKV89
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bilakos10 wrote:

Here’s my thermal regulation chart for Turbo



What I observed while conducting the thermal regulation:



  • The driver is constantly regulating the output in order to keep the temperature below a threshold.

  • At around 15 minutes, the flashlight’s temperature and output stabilizes at around 850 lumens.

  • The flashlight’s temperature never got too hot. 


I shall say that I’m really impressed that the flashlight was able to maintain > 1000 lumen for such a long period.

Thanks for the graph! Convoy’s new buck driver is impressive.

@Lojik
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Does anyone here know if there is any benefit to using a 40T in this light? It seems like the Samsung 50E would be the longest running and from what I understand work equally as strong as the 40T since 8amps is the limit anyway.

Is the 50E the ideal battery? It should be able to push this light to its max possible power still right?

ArtieT59
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@Lojik wrote:
Does anyone here know if there is any benefit to using a 40T in this light? It seems like the Samsung 50E would be the longest running and from what I understand work equally as strong as the 40T since 8amps is the limit anyway.

Is the 50E the ideal battery? It should be able to push this light to its max possible power still right?


Yes I be,8eve you are right about the 50e, since the driver is not running over 8ampa ever.
I run 40t, but only bc that’s all I have. 50e should be the same, unless there is some reason voltage sag or some other aspect takes place but I don’t know .

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Check out some of my new lights (picture heavy) and quick first impressions of them here: https://budgetlightforum.com/node/77180

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I don’t see any reason why you can’t use a 50E, but looking here I think the 40T probably performs better.

Certainly for the majority of the runtime. Or to put it another way, the larger capacity wouldn’t give you longer times, in fact probably shorter ones with less stability on the output.

adam7027
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@Lojik wrote:
Does anyone here know if there is any benefit to using a 40T in this light? It seems like the Samsung 50E would be the longest running and from what I understand work equally as strong as the 40T since 8amps is the limit anyway.

Is the 50E the ideal battery? It should be able to push this light to its max possible power still right?

Samsung 50E is now considered already an outdated cell, instead which you can get cells with similar capacity, but with better internal resistance (continuous current capability): 50G, 48X or (the currently hard to find, but fairly new and performant) 50S.

adam7027
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Chicken Drumstick wrote:
I don’t see any reason why you can’t use a 50E, but looking here I think the 40T probably performs better.

Certainly for the majority of the runtime. Or to put it another way, the larger capacity wouldn’t give you longer times, in fact probably shorter ones with less stability on the output.

Chicken Drumstick, you can also look at 21700 discharge curves in the 26650 comparator (where all of the curve is shown).

And I might think, that 40T also starts to be a slightly outdated cell (but for the first third of its capacity, still pretty good), as for mid current applications, the 50G seems to be already a better choice – and once HKJ shares a test about 50S, I guess, that will be even better.