【convoy】L21A with KW CULPM1.TG available now

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Tater Tot wrote:
id30209 wrote:

Tater Tot wrote:
Would this 8A driver be good for driving low forward voltage LEDs like SST-20DR?

 


Quit opposite…

I was thinking of 3x SST-20DR or 3x XP-G3 Photo Red on Convoy S12 with this driver.

Since it is a buck driver, it should create less heat than linear FET or AMC7135s?

96% efficiency, little heat generation

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JonnyBorneo wrote:
Any update on Convoy STB 90.2? What amp driver will this be paired with?

I want to compete with Noctigon K1 which costs $139.99.

18A for SBT90.2
the host is in production

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adam7027 wrote:
Hello Simon,

Can you confirm battery tube diameter for L21A? Is it 22mm or just 21.5mm?

Some are 21.5mm ,some are 22mm

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Simon Mao wrote:
adam7027 wrote:
Hello Simon,

Can you confirm battery tube diameter for L21A? Is it 22mm or just 21.5mm?

Some are 21.5mm ,some are 22mm

Can I specifically ask for 22mm, if I make an order?

I would also ask another request:

Could you please make a new item in the store? Which is same to this: https://www.aliexpress.com/item/33024385404.html , but with these differences:
- emitter choices should be: Samsung LH351D 5700K, 5000K, 4000K
- driver max current: 5A (but other driver specifications are the same)

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Simon Mao wrote:
Tater Tot wrote:
id30209 wrote:

Tater Tot wrote:
Would this 8A driver be good for driving low forward voltage LEDs like SST-20DR?

 


Quit opposite…

I was thinking of 3x SST-20DR or 3x XP-G3 Photo Red on Convoy S12 with this driver.

Since it is a buck driver, it should create less heat than linear FET or AMC7135s?

96% efficiency, little heat generation

Yes, but the SST-20 DR has a very low forward voltage which you need to use a special driver. If you use this driver it’ll burn through most of the battery voltage very quickly to run more efficiently at a lower voltage.

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contactcr
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Funtastic wrote:

Yes, but the SST-20 DR has a very low forward voltage which you need to use a special driver. If you use this driver it’ll burn through most of the battery voltage very quickly to run more efficiently at a lower voltage.

If it’s actually an 8A buck driver the excess voltage is not wasted. However, a true 8A buck driver will require a very large inductor and probably be quite expensive compared to most Convoy drivers so I wonder if something is lost in translation here..

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Okay, I’m not really familiar with a buck driver. There’s a thread all about the different types, I should go have a read up

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Funtastic wrote:
Okay, I’m not really familiar with a buck driver. There’s a thread all about the different types, I should go have a read up

The short answer is:

buck driver turns excess voltage into current
boost driver turns excess current into voltage

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contactcr wrote:
If it’s actually an 8A buck driver the excess voltage is not wasted. However, a true 8A buck driver will require a very large inductor and probably be quite expensive compared to most Convoy drivers so I wonder if something is lost in translation here..

The 8A driver does seem to have an inductor but is it big enough?

It is also around 2x more expensive compared to linear FET or 7135 drivers.

Edit: I just remembered that I asked him about this a month ago.

Simon Mao wrote:
Tater Tot wrote:
So it is a Buck driver?

Or is it buck-boost?

For more information, I need to consult the driver manufacturer.

Simon Mao wrote:
Tater Tot wrote:

Any updates on this driver?

It is a buck constant current drive,

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I have always wondered about that red stuff or other color on top of those components on drivers. What function does it have?

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MoreLumens wrote:

I have always wondered about that red stuff or other color on top of those components on drivers.

Looks like spaghetti or pizza sauce.  :-)

MoreLumens wrote:

What function does it have?

Good question.

I'd like to know as well.

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MoreLumens wrote:
I have always wondered about that red stuff or other color on top of those components on drivers. What function does it have?

I think it’s conformal coating.

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Didn’t realize it was already available. Yes it does look like a buck driver.

Considering it’s only on and around the inductor I would guess it’s to reduce high pitched noise they can sometimes have. “Coil whine”

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contactcr wrote:
Didn't realize it was already available. Yes it does look like a buck driver. Considering it's only on and around the inductor I would guess it's to reduce high pitched noise they can sometimes have. "Coil whine"

 

In convoy XHP35 12V boost driver is really quiet unlike the switch...


That red goo is actually glue that holds components while soldering .

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A few things landed and tested from Convoy, all really excellent thanks Simon!

L21A XHP35 HI 4000k : Really nice quality. Light is strong and pleasant.

S2+ with W2 Green : This is so much fun, it gets hot on high Wink Great power to weight ratio. Decent throw and spill.

Upgrades for C8: LH351D 5000k and OP Reflector. Such an awesome upgrade for my C8. Sliced the dome and it has decent throw, really nice color, noticeably warmer than 5000k, really awesome all rounder now!

- the best way to predict the future is to create it -

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adam7027 wrote:
Simon Mao wrote:
adam7027 wrote:
Hello Simon,

Can you confirm battery tube diameter for L21A? Is it 22mm or just 21.5mm?

Some are 21.5mm ,some are 22mm

Can I specifically ask for 22mm, if I make an order?

I would also ask another request:

Could you please make a new item in the store? Which is same to this: https://www.aliexpress.com/item/33024385404.html , but with these differences:
- emitter choices should be: Samsung LH351D 5700K, 5000K, 4000K
- driver max current: 5A (but other driver specifications are the same)

only 22mm 6A driver for L21A ,the current is too large for LH351D

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Simon Mao wrote:
only 22mm 6A driver for L21A ,the current is too large for LH351D

Bad news for me Crying

Apart from this, you mentioned, that a few of your latest driver are now buck-boost (very efficient, i saw you mention 96%, and no PWM at all). What are your current drivers, which work like these?

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adam7027 wrote:
Simon Mao wrote:
only 22mm 6A driver for L21A ,the current is too large for LH351D

Bad news for me Crying

Apart from this, you mentioned, that a few of your latest driver are now buck-boost (very efficient, i saw you mention 96%, and no PWM at all). What are your current drivers, which work like these?

Currently only this driver has such a high efficiency,

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Simon, any new info about lh351d 2700k and 3500k both cri90? Can you get them?

Also have you thought about making a 2.5A driver (like for CSLNM1.23) but with 12 groups and/or 4 modes?
This would be a good option for those who don’t want s2+ hotrods with 5A drivers.
I know you have 2.8A drivers with AMCs, but consider this suggestion too.

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Chatika vas Paus wrote:
Simon, any new info about lh351d 2700k and 3500k both cri90? Can you get them?

Also have you thought about making a 2.5A driver (like for CSLNM1.23) but with 12 groups and/or 4 modes?
This would be a good option for those who don’t want s2+ hotrods with 5A drivers.
I know you have 2.8A drivers with AMCs, but consider this suggestion too.

I have ordered LH351D 2700K,but not reach to me ,yet.
2.5A driver with 5 groups for KR CSLNM1.23 is in production , i didnt plan to produce it with 12 groups or 4modes.sorry

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What are the mode spaces of the 2.5A driver and what sizes of the driver will be produced?

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contactcr wrote:

If it's actually an 8A buck driver the excess voltage is not wasted. However, a true 8A buck driver will require a very large inductor …

Very large inductor? Not necessarily. Inductor size increases both with conductor width and with inductance value. This specific driver isn't meant to handle 2 cells in series, it is meant to efficiently drive low Vf emitters at high currents with just single cell input. Thus, no large inductance value is required which saves inductor size:

 

 

The above inductor is just of 470nH value (very very small), and pretty sure it is a high current handling inductor. It is the exact recipe for a single cell high current buck driver, which on the other hand is a smart choice as it offloads a lot of heat from the driver which otherwise would be burnt in the MOSFETs like it happens in all of the newer Convoy 5A and 6A linear drivers. Given the requirements (low emitter Vf and pretty high current) the above design is a completely logical and smart choice. Kudos for this.

P.S.: 8A? Wow! I think that is a bit “on the edge”, but well…

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Brilliant analysis after seeing driver. Kudos for this.

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Hopefully, Simon will "pimp" all models to this standard (or better) in his store...

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Question for Simon:

 

 

Base diameter:

 

 

Aditionally, total reflector height is ≈50.5mm.

Is that the Convoy L2/L21A reflector? If so, I'll have to order a spare part. 

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Simon Mao][quote=Chatika vas Paus wrote:
I have ordered LH351D 2700K,but not reach to me ,yet.

Looking forward to that in the S2+ and S12.

Please Simon can we have constant frequency strobes in your lights (e.g. 10Hz) instead of the alternating/two frequency strobes. You are losing lots of sales to light painting photographers by not having a constant frequency strobe in Biscotti and 12 Mode UI.

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Hello Simon,
I want to swap emitter and driver on the just arrived Z1, but can’t figure out how to disassemble the driver section?
Can you give me the right direction please?

Thx

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Simon Mao wrote:
JonnyBorneo wrote:
Any update on Convoy STB 90.2? What amp driver will this be paired with?

18A for SBT90.2
the host is in production


Oh boy Oh boy Oh boy Party
Simon Mao
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Blggg wrote:
What are the mode spaces of the 2.5A driver and what sizes of the driver will be produced?

uh ,sorry ,what’s mode spaces?

it’s 17mm diameter

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Barkuti wrote:

Question for Simon:


 



 


Base diameter:


 



 


Aditionally, total reflector height is ≈50.5mm.


Is that the Convoy L2/L21A reflector? If so, I’ll have to order a spare part. 

reflectors in L2 and L21A are the same

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