【convoy】SFT70 3000K CRI95 available

[BlueSwordM]

@tactical_grizzly, the linear driver would be inefficient, and waste a lot of power, a lot more than in a 1S setup.

[Scallywag]

@Fedtro

Simon, why can’t we have in the LED options a Yinding 5050 or G50 as Haikelite calls it which is an excellent throw LED with a luminance higher than Osram CULPM1.TG and an output higher than 2000 lumens?

Luminance higher than CULPM1.TG? Do you have a source for that?

[BlueSwordM]

Yeah, I really really doubt that, although it is possible since there is a 5050 2mm2 round LED around here.

[Hoop]

@Scallywag

@Fedtro

Simon, why can’t we have in the LED options a Yinding 5050 or G50 as Haikelite calls it which is an excellent throw LED with a luminance higher than Osram CULPM1.TG and an output higher than 2000 lumens?

Luminance higher than CULPM1.TG? Do you have a source for that?

@Fedtro

By now the new generation of Chinese LEDs is equal if not superior even to Cree or Luminus so you who are an innovator could try to make some products and see how customers respond …

I’d wager that neither luminance or efficiency are as high. And then there’s tint, lumen maintenance, thermal conductivity of the substrate, part to part consistency, etc.

[QReciprocity42]

I have similar doubts. Efficiency is almost certainly lower due to higher Vf, which also makes regulation harder.

Another problem is that the round die tends to be noticeably off-center relative to the emitter footprint in many samples I've seen online. It's ok for aspherics but will mess up the beam in a parabolic reflector.

[Simon_Mao]

@tactical_grizzly

@LunaLoves

@tactical_grizzly

@LunaLoves

what type of driver does the M21G use?

GT-FC40 uses a 12V 4A boost driver. XHP70.3-HI uses a 6V 8A linear driver.

8A linear or 5A how Simon stated earlier?

M21G uses an 8A driver for XHP70.3-HI as stated on the product page.

The 5A driver Simon is referring to here is in M21F, not M21G.

@BlueSwordM

@tactical_grizzly, I don’t think it uses a linear driver for the 6V LED lmao.
It probably uses a buck driver.

@Haukkeli

It could be buck driver also. I would estimate that it could regulate 8A output to about 6.4 battery volts before it drops off. Then only lower modes.

I could be wrong about it being linear. That would be awesome if that’s the case! Is there some technical reason a linear driver would not work?

Right now I believe it’s linear because of the price point, output current, the fact that Simon usually (not always) uses linear drivers where emitter & cell voltages are similar, and this light’s similarity to L6 (which uses a linear driver with XHP70.2 as far as I’m aware).

Simon, can you tell us whether M21G uses a Buck or Linear driver with XHP70.3-HI?

Buck driver
4 modes ,output 0.251A - 0.821A - 2.42A - 8.05A,Their efficiency in order is 80–88–92–94,
Under the protection of temperature, The current will drop to a minimum of 2.49A

[tactical_grizzly]

@Simon Mao

@tactical_grizzly

@LunaLoves

@tactical_grizzly

@LunaLoves

what type of driver does the M21G use?

GT-FC40 uses a 12V 4A boost driver. XHP70.3-HI uses a 6V 8A linear driver.

8A linear or 5A how Simon stated earlier?

M21G uses an 8A driver for XHP70.3-HI as stated on the product page.

The 5A driver Simon is referring to here is in M21F, not M21G.

@BlueSwordM

@tactical_grizzly, I don’t think it uses a linear driver for the 6V LED lmao.
It probably uses a buck driver.

@Haukkeli

It could be buck driver also. I would estimate that it could regulate 8A output to about 6.4 battery volts before it drops off. Then only lower modes.

I could be wrong about it being linear. That would be awesome if that’s the case! Is there some technical reason a linear driver would not work?

Right now I believe it’s linear because of the price point, output current, the fact that Simon usually (not always) uses linear drivers where emitter & cell voltages are similar, and this light’s similarity to L6 (which uses a linear driver with XHP70.2 as far as I’m aware).

Simon, can you tell us whether M21G uses a Buck or Linear driver with XHP70.3-HI?

Buck driver
4 modes ,output 0.251A - 0.821A - 2.42A - 8.05A,Their efficiency in order is 80–88–92–94,
Under the protection of temperature, The current will drop to a minimum of 2.49A

BlueSwordM looks like you were right! This is great news!

Thank you for clarifying, Simon!

[Fedtro]

[quote=Scallywag]

@Fedtro

Simon, perché non possiamo avere nelle opzioni LED un Yinding 5050 o un G50 come lo chiama Haikelite che è un eccellente LED a focale con una luminanza superiore a Osram CULPM1.TG e un'uscita superiore a 2000 lumen?

Luminanza superiore a CULPM1.TG? Hai una fonte per questo?
[/quote]

https://budgetlightforum.com/t/-/68542

[Fedtro]

https://budgetlightforum.com/t/-/68542

[zeremefico]

Simon said me that m21g is not compatible with 4v leds, like sft40.
Since it has buck driver, shouldn’t 4v leds work or i am missing something?

[prikolow]

The S21D gets very hot.
It is currently available in 219B, 519A and XPL HD LED.

Which one has a high CRI (or the highest CRI) and which one stays as cool as possible?
I read the S21D can only be operated at 50% maximum otherwise it gets too hot, which limits the 12 group options.

[Ryzbor]

Afaik the S21D has a thermal limit of 55°C which is by no means too hot.

Maybe you have read about one which had a not working thermal sensor.

The 8A buck driver can sustain ~800lm of high CRI light with a good tint on the 519A without stepping down which is a great result.

[PiercingTheDarkness]

@Ryzbor

Afaik the S21D has a thermal limit of 55°C which is by no means too hot.

Maybe you have read about one which had a not working thermal sensor.

The 8A buck driver can sustain ~800lm of high CRI light with a good tint on the 519A without stepping down which is a great result.

No, the Convoy drivers don’t reduce below the high level, this causes many smaller models to get far too hot. The 8A doesn’t reduce below High, the 4X18A and 3X21A hit 80°C+

The 8A has a thermal timed stepdown, there’s no temp limit

[tactical_grizzly]

@Funtastic

the Convoy drivers don’t reduce below the high level, this causes many smaller models to get far too hot

This has been my experience as well, just to back you up. Most of them have some sort of stepdown (be it timed or thermal) between 100% and the next-highest-mode (usually 35) but they will not dip below 35 output. That’s a problem because some models can still overheat at 35% output.

[Simon_Mao]

@zeremefico

Simon said me that m21g is not compatible with 4v leds, like sft40.
Since it has buck driver, shouldn’t 4v leds work or i am missing something?

sorry ,i dont have a suitable driver for M21G with SFT40

[stephenk]

@prikolow

The S21D gets very hot.
It is currently available in 219B, 519A and XPL HD LED.

Which one has a high CRI (or the highest CRI) and which one stays as cool as possible?
I read the S21D can only be operated at 50% maximum otherwise it gets too hot, which limits the 12 group options.

519A will provide the most high-CRI lumens. XPL will provide the most low-CRI lumens. All will run at the similar temp on 100% and 35%.

[Thermolumo]

On a separate topic: are there any plans for a Convoy that combines the driver of an L7 with the head of an l8? That would be my ideal affordable SBT90.2 light.

[Simon_Mao]

@Thermolumo

On a separate topic: are there any plans for a Convoy that combines the driver of an L7 with the head of an l8? That would be my ideal affordable SBT90.2 light.

This may seem top-heavy.

[PiercingTheDarkness]

I’d love to see a hunting headlamp that uses 3x Osram LEDs: White, Green, Red with range out to 300m for the white and green, even 200m would be nice. It would be something different

[Simon_Mao]

@Funtastic

I’d love to see a hunting headlamp that uses 3x Osram LEDs: White, Green, Red with range out to 300m for the white and green, even 200m would be nice. It would be something different

this needs a reflector with large diameter