GT mini~reflash the latest firmware~

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steel_1024
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GT mini~reflash the latest firmware~

Please forgive me through Google Translate

GT’s long-range ability is super strong, and it is deeply praised by users!
However, if XHP70.2 is installed, it can fully exert its full strength.
So, should there be a GT 70?

Recently launched a reduced version of the GT mini
Use 18650 battery, XP-L Hi LED, and inherit the easy-to-use NarsilM interface

It is said that
Smaller GT micro, using AAA, 10400 batteries
Really blowing up for a while GT crazy

Brothers come first to recognize each other

GT mini is very delicate and beautiful carton packaging

Big brother asked, must take another photo

what? .. more…

Drawer packaging

inner box

18350 adapter
I don’t know if there will be official shipments? Will there be spare parts, hand ropes, etc.

positive

back

Brother photo

Big head and small head

CREE XP-L Hi

18350 plain transfer tube

Single photo

Because i want to change the final decision firmware
Start to dismantle…

The circuit is FET+1 (7135), and the switch is on the circuit.

FET model

Positive electrode on the back of the circuit, thermoelectric separation copper substrate

Tail cap double spring

Tail cover rope hole

trademark

model

Rectangular thread

Body thickness

Side button, metal outer ring interference fit, do not dare to dismantle

Inside of the button

There is a green LED below the button

smile

Reflash the final firmware

Reflash successfully

Test and then install

18650GA(10A) Turbo

Highlight (Ramp brightest)

VTC6 (30A) Turbo

Highlight (Ramp brightest)

Photo wall, concentrated light

Thanks for watching

Sorry for my poor english.

Edited by: steel_1024 on 07/19/2018 - 11:33
mortuus
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wow amazing photos, i really like the box looks good better then blf gt bigger brother Big Smile nice job steel!

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goshdogit
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Very nice! Thank you for the glimpse at the driver. Thumbs Up

joechina
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Nice!
Is it hard to get the driver out? How much glue?

steel_1024
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joechina wrote:
Nice! Is it hard to get the driver out? How much glue?

My GT mini has no glue.

The driver must be pressed with the barrel.

Replace the battery from the rear.

Sorry for my poor english.

-X3-
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Sorry but FET+1 driver ?! I thought Lumintop went for a regulated 4,5A buck driver ?

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X3 wrote:
Sorry but FET+1 driver ?! I thought Lumintop went for a regulated 4,5A buck driver ?

Yeah, came here to ask this question. The manual that was published indicated a regulated buck driver. I know at least one person who was interested in the light in part because they wanted to swap in a de-domed Nichia 219D. The low V_f of the 219D would play very nicely with a buck driver, but not with a FET+1. Not only that, but a FET+1 kinda seems boring at this point, making it too similar to the Emisar D1S and Astrolux C8. A well-designed buck driver would have been a nice differentiating feature in a rather crowded category.

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Also wondering about the driver change from the manual…

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you can read the latest documents here:
GTmini user manual & NarsilM CheatSheet GTmini

 

i try to find out why a "buck driver" is mentioned in the manual

find all available items in this list

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find a short description about my idea here

 

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Bob_McBob
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GT mini manual wrote:
Driver: 17 W, 4.5 A regulated buck driver with conversion efficiency that exceeds 90%. Parasitic drain while OFF is ~27 μA.
steel_1024 wrote:
The circuit is FET+1 (7135)

So which is it?

SKV89
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steel_1024 wrote:
joechina wrote:
Nice! Is it hard to get the driver out? How much glue?

My GT mini has no glue.

The driver must be pressed with the barrel.

Replace the battery from the rear.

Is yours a special preproduction unit? You always get things before everyone else. I’m hoping there’s no glue for the shipping version too.

Thanks for the great photos as usual!

joechina
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M4D M4X wrote:

you can read the latest documents here:
GTmini user manual & NarsilM CheatSheet GTmini


 


i try to find out why a “buck driver” is mentioned in the manual

Because its an error in the manual.

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nice to see the actual flash process, thanks for the steps/pictures.

Texas_Ace
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The driver is a FET+1 design. A buck driver was considered but it would limit the output greatly with the XP-L HI LED.

I have yet to see a China buck driver for a single cell light that was in regulation for more then a few minutes. Usually they drop out of regulation almost instantly. Rendering the entire point of a buck drive moot except for low modes.

The manual was copied from the normal GT and the buck part just slipped through and was not put in there intensionally.

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Yeah; a buck would really limit it with the high vf of the xpl hi, but it was the only real reason for me to get this light: the potential to soon put something with a Vf too low for a fet+1. If it’s going to be so similar to the d1s, I’d rather go with that. Besides, I have a thing about when, after lots of people’s money has already changed hands, things turn out to not be as they were described. (In the manual, in this case.)

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Of course almost all buck drivers fail to regulate using only an 18650 at turbo outputs for more than a few minutes, especially with an XPL HI.

To maximize runtime with buck drivers, you need to either bypass the spring/use a copper alloy spring, use a high drain high capacity battery such as a 30Q, minimize voltage drops in the buck driver itself, and etc.

An XPL2 HI would also help. Or maybe a E21A.

TLDR: Unless you go with a 2S setup, maximizing buck driver efficiency and voltage delta is crucial.

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If performance on turbo was all that mattered, almost no one would care at all about regulated drivers in 1s lights.

And yet, some guy, goes by the username Texas_Ace, created a really nice family of drivers with two channels of (linear)regulation and turbo.

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eas
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Texas_Ace wrote:
The driver is a FET+1 design. A buck driver was considered but it would limit the output greatly with the XP-L HI LED.

Is this the first time this has been shared publicly?

This non-political signature is not non-political.

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Thanks for the review and update steel. Beer

My current and or voltage measurements are only relevent to anything that I measure.

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eas wrote:
Texas_Ace wrote:
The driver is a FET+1 design. A buck driver was considered but it would limit the output greatly with the XP-L HI LED.

Is this the first time this has been shared publicly?

eas wrote:
If performance on turbo was all that mattered, almost no one would care at all about regulated drivers in 1s lights.

And yet, some guy, goes by the username Texas_Ace, created a really nice family of drivers with two channels of (linear)regulation and turbo.

lol, very true.

I was not involved in the mini-GT project until it was basically finished. All I had a say in was the firmware basically. I gave a few suggestions early on but most of them were not used.

I honestly have not followed this light almost at all, been too focused on the Giggle Monster and some other lights to think about this one since I did not have much say in it to start. So I am not sure what has been posted before.

I was asked in a message what driver it had and confirmed it was an FET driver.

All of that said, I do feel that an FET driver makes the most sense all things considered for this light. A buck is nice and if it was going to come from the factory with a low Vf emitter then I would say a buck could make sense (although regulated runtime at turbo would still be quite short) but with the XP-L HI I see no use for a buck driver in this light.

Also I have learned a lot the last few years about driver efficiency and things are not nearly as bad as we once thought with a PWM FET + N driver.

Throwers are not generally used at low modes so the only advantage a buck driver would have (slightly longer battery life at lower outputs) is rendered almost moot.

The real future of flashlight drivers are boost drivers IMHO. The XHP series of LED’s blow basically any 3V LED away in performance.

Naturally it is up to each person if they still want the light with an FET driver. Be aware though that with the stock setup (which is all that really matters to lumintop understandably) it would reduce the peak output by a significant amount.

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Quote:
The XHP series of LED’s blow basically any 3V LED away in performance.

Ehh… not so much for compact throwers, I think. The XHP35 HI does well with multiple 18650s and a huge reflector, but lights with only one Li-ion cell and a boost driver rarely make their advertised numbers with the XHP35. I don’t know of anything using the XHP35 HI that’s the size of a C8 and throws farther than a FET+XP-L HI C8, for example. Do you?

Note that advertising more throw is insufficient to satisfy my query; someone whose incentives align with the community more than the manufacturer must supply the numbers.

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Texas_Ace
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zak.wilson wrote:
Quote:
The XHP series of LED’s blow basically any 3V LED away in performance.

Ehh… not so much for compact throwers, I think. The XHP35 HI does well with multiple 18650s and a huge reflector, but lights with only one Li-ion cell and a boost driver rarely make their advertised numbers with the XHP35. I don’t know of anything using the XHP35 HI that’s the size of a C8 and throws farther than a FET+XP-L HI C8, for example. Do you?

Note that advertising more throw is insufficient to satisfy my query; someone whose incentives align with the community more than the manufacturer must supply the numbers.

I said the XHP35 blows the other LED’s out of the water, that does not factor the driver into the equation.

The reason the XHP35 single cell lights underpreform up to now is that they all under-drive the XHP35 by a fair amount. The highest output boost driver I have seen was something like 1.25-1.5A output vs the 2.5-3A we want.

There are drivers in the works that will be able to do this but they are not ready yet.

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Can anyone explain why Steel is only getting 3.4 amps from a high drain battery? I would expect more. At least 4.5A.

Is it due to the super long LED wires he’s using to test with?

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70.2, 26350 cells (4,100 lumen!), Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

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Texas_Ace
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JasonWW wrote:
Can anyone explain why Steel is only getting 3.4 amps from a high drain battery? I would expect more. At least 4.5A.

Is it due to the super long LED wires he’s using to test with?

Yes, those wires will cause a massive voltage drop and thus current drop.

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Texas_Ace wrote:
JasonWW wrote:
Can anyone explain why Steel is only getting 3.4 amps from a high drain battery? I would expect more. At least 4.5A.

Is it due to the super long LED wires he’s using to test with?

Yes, those wires will cause a massive voltage drop and thus current drop.


Okay, that’s good to hear.

Were you able to do a tail cap amp draw test to see what it does in the light?

With a FET, it could exceed the 1200 lumen and throw specs.

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70.2, 26350 cells (4,100 lumen!), Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

10 NarsilM user videos for BLF Q8, GT, GT Mini and ROT66

Texas_Ace BLF Calibrated Lumen tube

Maukka Calibration Lights for DIY Lumen Measuring Devices 

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Thanks for the great pictures steel_1024, well done!! (as usual Wink ) Thumbs Up

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Thank you for reviewing.. Sharp Pics btw.. Cool

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JasonWW wrote:
Texas_Ace wrote:
JasonWW wrote:
Can anyone explain why Steel is only getting 3.4 amps from a high drain battery? I would expect more. At least 4.5A.

Is it due to the super long LED wires he’s using to test with?

Yes, those wires will cause a massive voltage drop and thus current drop.


Okay, that’s good to hear.

Were you able to do a tail cap amp draw test to see what it does in the light?

With a FET, it could exceed the 1200 lumen and throw specs.

I can get some readings but I swapped the LED in mine to a NW LED so it would not necessarily match what would be seen in the production version since the Vf varies among the LED’s.

If people really want to see I can check though.

I did test the lumen output before I swapped the LED and with the new TA sphere it read a bit over 1200 lumens.

JasonWW
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Hmmm, it’s good it does hit the spec’d lumens, not everyone can say that. Wink

I guess I was hoping for a bit over spec since it’s FET. Maybe 6A and 1400 lumen. Big Smile

IDK, that might be pushing things. I guess spring bypasses can still be done.

PS, I just noticed they raised the lumen spec from 1200 to 1250.

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70.2, 26350 cells (4,100 lumen!), Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

10 NarsilM user videos for BLF Q8, GT, GT Mini and ROT66

Texas_Ace BLF Calibrated Lumen tube

Maukka Calibration Lights for DIY Lumen Measuring Devices 

Review Jaxmnve M1 Stainless 10180 Keychain light

Texas_Ace
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JasonWW wrote:
Hmmm, it’s good it does hit the spec’d lumens, not everyone can say that. Wink

I guess I was hoping for a bit over spec since it’s FET. Maybe 6A and 1400 lumen. Big Smile

IDK, that might be pushing things. I guess spring bypasses can still be done.

PS, I just noticed they raised the lumen spec from 1200 to 1250.

Yeah, I read 1250 lumens on my sample so I guess they are using that number now.

Spring bypasses would net you a bump in performance but ~1300-1400 lumens is about the most an XP-L HI can do in my experience.

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