【convoy】17mm SST40 driver with biscotti firmware and temperature protection will be available

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Barkuti
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Someone told me somewhere around here that temperature control was too aggressively implemented in SST40 drivers, causing step down very quickly. I myself grabbed a couple drivers to repair a couple builds for family and a friend but haven't done tests. What do you believe? 

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Yokiamy
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Barkuti wrote:

Someone told me somewhere around here that temperature control was too aggressively implemented in SST40 drivers, causing step down very quickly. I myself grabbed a couple drivers to repair a couple builds for family and a friend but haven’t done tests. What do you believe? 

It totally depends on the host.
For instance, in a S2+ /S21 it might be useful, but on a L21A however, it doesn’t make any sense

I got rid of it by removing the NTC, instructions can be found here.

  BLF

echikongen
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I have a question regarding LVP on the latest Convoy flashlights (S11, S12, M3, S21A, M21A, L21A, M21B, M21C, M26C). Is there a real LVP or only warning?

Barkuti
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echikongen, concerning flashlights with unregulated MOSFET or linear drivers there is no need to worry. A standard blue crystal pump white led imposes a hard limit concerning the absolute minimum voltage which makes it work, this is ≈2.5 V (red emitters are another story). This means it is nearly impossible to over-discharge a li-ion cell with a standard white led as load. This has been tested by myself, feeding a white led with a li-ion cell directly with bare wires. With a driver in between, the over-discharge possibility is even lower.

If you want to really know, test it by yourself by leaving whatever flashlight with MOSFET or linear driver turned on for a few days. After the elapsed time, unload the battery, let it rest a few minutes and measure its no-load voltage with a multimeter. It will hardly be any lower than 2.5 V, if even close.

Concerning flashlights with boost or buck drivers powered with more cells than emitter stages (i.e. a buck driver fed with 2 cells powering a 1S emitter like an XP-L, buck driver fed with 3 cells powering a 2S emitter like an XHP50B, etc.), some sort of low voltage protection or shutdown is a must. In all these cases it usually is implemented unless it is a shoddy driver which Convoy wouldn't use. 

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Jerommel
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Simon Mao wrote:
Sao_Lune wrote:
Simon, please, add additional version of this driver: https://www.aliexpress.com/item/33024201368.html WITHOUT memory-modes.
If you think that memory-modes in your drivers is necessary, then let it be, but =======>>>>>>>>>>>>>>

Please give us a choice!

All I need is S21A without ANY memory-mode. I want to start with LOW-mode. Always.

SST40 driver with biscotti is in design ,friend


So this is the new complaint after “I want a useless moon mode!” ?
I think memory is quite handy, and i bet many more people do too.
My complaint though, is the mode spacing of your drivers, Simon.
I ordered some anyway, but there are low and medium modes missing, big jumps from low to medium, probably because loud voices beg for moon mode..
As if they don’t own any smaller output flashlights already…

Maybe don’t forget most of your buyers (probably) want 4 well spaced usable modes, like 3 – 10 – 30 – 100%
3 modes is enough for up to 1000 Lumen lights.

extremesquared
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Jerommel wrote:

As if they don’t own any smaller output flashlights already…

Maybe don’t forget most of your buyers (probably) want 4 well spaced usable modes, like 3 – 10 – 30 – 100%
3 modes is enough for up to 1000 Lumen lights.

3% is much too high of a low for camping/backpacking use, which is one demographic target of generic flashlights. It sounds like you need a specialized driver for urban use, but that’s not necessarily the best default driver to sell in their online store.

Jerommel
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extremesquared wrote:
Jerommel wrote:

As if they don’t own any smaller output flashlights already…

Maybe don’t forget most of your buyers (probably) want 4 well spaced usable modes, like 3 – 10 – 30 – 100%
3 modes is enough for up to 1000 Lumen lights.

3% is much too high of a low for camping/backpacking use, which is one demographic target of generic flashlights. It sounds like you need a specialized driver for urban use, but that’s not necessarily the best default driver to sell in their online store.


3% of 10 Watts is 0.3 Watt.
How can that be “much too high”, even in a tent at night?
BTW, i use my lights the most when i’m in rural France, so i know what darkness is.
Besides, when you only have 3 or 4 modes, you basically sacrifice a usable mode when you add a moon mode to it.

But either way, inside a tent, it is preferable to have a wide flood light (like a light bulb) hanging from the ceiling, but that is not always possible.
In a tent a normal reflector light is far from ideal.

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I was actually wondering if we were used to different levels of darkness. It is something a lot of people who have access to low population density areas take for granted. Seeing the Milky Way plastered across the sky on a dark night is amazing. But it sounds like we just are accustomed to different methods.

To be fair, we always got by before any flashlights had moonlight mode by blocking the lens with a thumb at night. It was not that big of a deal, but now with the luxury of <2 lumen modes we don’t have to. Now the brightest things I see in camp are overpowered 5mm red LEDs on cheap plastic headlamps. I am only one data point, but I wouldn’t buy a 1000 lumen light that didn’t have the 0.1% mode any more due to the way we use flashlights in the wilderness.

I don’t care about mode memory myself — there are pros and cons — but predictability of modes is important to some people. It would be nice if it was possible to cut a trace on the circuit board to disable the memory.

Jerommel
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extremesquared wrote:
I was actually wondering if we were used to different levels of darkness. It is something a lot of people who have access to low population density areas take for granted. Seeing the Milky Way plastered across the sky on a dark night is amazing. But it sounds like we just are accustomed to different methods.

To be fair, we always got by before any flashlights had moonlight mode by blocking the lens with a thumb at night. It was not that big of a deal, but now with the luxury of <2 lumen modes we don’t have to. Now the brightest things I see in camp are overpowered 5mm red LEDs on cheap plastic headlamps. I am only one data point, but I wouldn’t buy a 1000 lumen light that didn’t have the 0.1% mode any more due to the way we use flashlights in the wilderness.

I don’t care about mode memory myself — there are pros and cons — but predictability of modes is important to some people. It would be nice if it was possible to cut a trace on the circuit board to disable the memory.


Okay, i see your point about camping etcetera.
But i have other lights low level usage.
In a tent it’s always a little difficult though.
You need one hand to lean on, and the other hand to move stuff around.
No flat surfaces to tailstand a flashlight on…
Yes, a headlamp would be okay, or a single AAA light you can hold in your mouth, but some wide flood light hanging from the ceiling would be better.

As for memory, well, opinions vary.
I hardly ever switch off in the highest mode anyway.
But when i switch it on, i don’t want a moon mode to skip through.

Aaaaanyway… This is the Convoy thread..
I decided to comment because i decided to buy some drivers from Simon, but most of them are missing a low or mid mode, jumping to or from 10 times the brightness to the next mode…
That just sucks i.m.h.o.
But apparently the solution will be complicated firmware that takes ours to configure..
I don’t know, maybe it’s me…

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I bet people would be happy with another mode and finer spacing. I only object to the removal of the lowest mode because that would be removing a feature.

Also when backpacking/bikepacking in groups of 3 or more not many of us bring an extra light. Redundancy comes from the group size.

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I got a Cometa that runs bistro/biscotti/baguette/whatever, and all this crap is selectable. Moonlight on/off, hml/lmh, mem/nomem, buncha modegroups, etc.

Can’t just dump that UI on the driver’s µC?

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

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adam7027 wrote:
Will be throwier TIRs considered for newer Convoy flashlights?

There are a few very nice LEDIL TIR optics with bigger head diameter.

+1.

18650 convoy C2+ with same body slightly bigger head diameter, with TIR.

Jerommel
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extremesquared wrote:
I bet people would be happy with another mode and finer spacing. I only object to the removal of the lowest mode because that would be removing a feature.

Also when backpacking/bikepacking in groups of 3 or more not many of us bring an extra light. Redundancy comes from the group size.


I think you should bring an extra AA or AAA light.
I definitely would.
Just in case the larger one fails and for low level lighting (like in a tent)
It’s not as if an AA or AAA light congests your backpack or adds significant weight.
Jerommel
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Lightbringer wrote:
I got a Cometa that runs bistro/biscotti/baguette/whatever, and all this crap is selectable. Moonlight on/off, hml/lmh, mem/nomem, buncha modegroups, etc.

Can’t just dump that UI on the driver’s µC?


Yeah, i’ve been thinking about that, and thus getting some reflashing gear.
It seems it’s the only way to get a normal UI..
cornz
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IMHO a flashlight / torch should have 2 modes.
0% (off) and 100%.
Anything else is a solution looking for a problem.

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cornz wrote:
IMHO a flashlight / torch should have 2 modes.
0% (off) and 100%.
Anything else is a solution looking for a problem.

 Quite funny! Big Smile

First of all we call that single mode. We do not count “power off” as a mode, that is absurd. Absurd as some chinese cheap flashlight ads where they count “zoom in” and “zoom out” as modes. 

Once you get used to having a handful of output intensity levels, it's all good.

The Light Innocent I am

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One mode would be unpractical if the flashlight has lot of power. Quick overheating, unpractical in short distances, generally unpractical. I think Convoy makes good UI, simple 4 modes is enough for me. Sure, it could have ability to turn mode memory on or off, or have 2 groups of modes, one 20% 100% and the other one more EDC.

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Guys, (and TK) what do you think about 3xXHP70.2 in Convoy 4×18A? It has a quite big head, and only one XHP seems too little for me. Do you think 3 would be better, worth trying?

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A triple reflector is much less deep, so you’re left with a lot of unused space in the head.
Besides, you’ll lose all throw because of the small reflectors, but i know it can be fun.
But a dedicated design would be better, but you can get that from other brands already.

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Mocarny wrote:
Guys, (and TK) what do you think about 3xXHP70.2 in Convoy 4×18A? It has a quite big head, and only one XHP seems too little for me. Do you think 3 would be better, worth trying?

This can be an interesting flashlight for close range. Or 4xXHP50.2 (4000K), then will throw a little more.

Sorry for my poor english.

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10%-30%-50%-70%-100% – It would be ideal for those who use cycling ..

"... God is light, and in him is no darkness at all..." 1 John 1:5 (KJV)

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Will you use biscotti in your 20 and 22mm drivers too? (6A)

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Jerommel wrote:
A triple reflector is much less deep, so you’re left with a lot of unused space in the head.
Besides, you’ll lose all throw because of the small reflectors, but i know it can be fun.
But a dedicated design would be better, but you can get that from other brands already.

Yes, less throw, but much more lumens. There is already S12 with 3x led, and I like it’s beam pattern and throw. I know there is SST20, but… More lumens with less throw would be nice. And funny.
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Anthon wrote:
Will you use biscotti in your 20 and 22mm drivers too? (6A)

yes ,after China spring festival

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Simon, will the upcoming biscotti in 22 mm driver work with nichia? I have the S12, nichia-5700k. It’d be great if this will work with it.

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Blggg wrote:
Simon, will the upcoming biscotti in 22 mm driver work with nichia? I have the S12, nichia-5700k. It’d be great if this will work with it.

yes, suitable

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gerasalex wrote:
10%-30%-50%-70%-100% – It would be ideal for those who use cycling ..

The differences between 30, 50, 70 and 100 are too small.
Especially 50 – 70 – 100.
Even from 50 to 100% is a very small step to the eye.
Or did you mean ideal for people who like to pointlessly cycle through modes? Silly
EasyB
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Jerommel wrote:
gerasalex wrote:
10%-30%-50%-70%-100% – It would be ideal for those who use cycling ..
The differences between 30, 50, 70 and 100 are too small. Especially 50 – 70 – 100. Even from 50 to 100% is a very small step to the eye. Or did you mean ideal for people who like to pointlessly cycle through modes? Silly

Our brightness perception is not linear with the current, but heat and runtime are. So it is useful to have more modes in the upper brightness region in order to maximize the sustainable brightness for your particular ride duration. For example, for my 1.5 hour night rides I might want the max brightness for my S2+ with 8×7135 driven XPL, which would be about a 70% mode. Of course it will still be difficult to have a mode set that works for everyone and every light.

Jerommel
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EasyB wrote:
Jerommel wrote:
gerasalex wrote:
10%-30%-50%-70%-100% – It would be ideal for those who use cycling ..
The differences between 30, 50, 70 and 100 are too small. Especially 50 – 70 – 100. Even from 50 to 100% is a very small step to the eye. Or did you mean ideal for people who like to pointlessly cycle through modes? Silly

Our brightness perception is not linear with the current, but heat and runtime are. So it is useful to have more modes in the upper brightness region in order to maximize the sustainable brightness for your particular ride duration. For example, for my 1.5 hour night rides I might want the max brightness for my S2+ with 8×7135 driven XPL, which would be about a 70% mode. Of course it will still be difficult to have a mode set that works for everyone and every light.

Oh okay. Thank for explaining.
The LD25 driver would be good for cyclists then, since you can set all 3 modes individually.
…but it’s only 3 modes though… (plus strobe).

By the way, i’m currently running an 18650 10 Watt light on my bike, with an LD25 driver, which is not adjusted (yet).
But i think the middle mode is 50% and it’s just not worth it i.m.o. to have a mode in between.
What i can do though, is switch to 100% when needed, because i normally run it on 50%.
But it’s not a big difference to the eye.
(To me it would seem sensible to have 25 – 50 – 100 % for a bike, or maybe 18 – 35 – 70 %)

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Hey Simon when will the new biscotti drivers be for sale?

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