BLF GT official support thread [FAQ updated 11 Jan 2018]

[square74]

I took my GT apart real quick and took a few pictures. Here you go.

how did you got it open?

With this ones:
https://www.amazon.de/gp/product/B003XMWQOU/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

It doesn´t work with mine BLF GT.

[JasonWW]

@square74

I took my GT apart real quick and took a few pictures. Here you go.

how did you got it open?

With this ones:
Amazon.de

It doesn´t work with mine BLF GT.

Did you loosen the head first?

I showed how I did it in post #93.

Loosen the head first, then the bezel if you need to.

[ChibiM]

@teacher

@Joey Adams

Guys please remember that if you follow ChibiM excellent pics and tutorial on removing the spacers on the gt battery carriers you will be removing the only protection the gt has for installing the batteries the wrong way. As long as you are careful, no problem, however it only has to happen once to really screw up this monster light. Cheers!

*+1… Well said. Also remember you are on your own if you decide to do this. If you screw up that one time & burn or blow up your light… don’t complain. You did it to yourself. Any warranty WILL NOT apply. BE CAREFUL IF YOU DO THIS!!!

+1 +2 +3

Yep. Only do at your own risk.....

[Texas_Ace]

@stanmore

Texas_Ace, chrisc

Out of curiosity, did anything ever happen with The Gadget Show?
Would be very interesting to see how much they can misrepresent a light like this because “its too big”. Its been many years since I have watched an episode and not needed a heap of salt to go with what they say…

I have no idea actually. ChrisC was the one talking to them and I never heard anything more after the last contact with them.

[joechina]

Well, the gadget show has its own thread:

Flashlights on TV - BLF GT & The Gadget Show (Channel 5)

A researcher for The Gadget Show reached out to the forum asking if it was possible to get hold of a BLF GT for a new show that they was planning to film. It was highly unlikely that they would get hold of a GT in time so I let them use mine for filming. I also gave them an Emisar D4 to play with. They sourced a DX80 from TACLIGHT to use alongside some other lights. They had some top quality gear and I am looking forward to seeing the show when it airs in a month or so. [image]

[M4D_M4X]

after someplaying i found time to notice my Turbo is only 7% more Lumens (ceilingbounce in 3 locations) than full ramp :(

using my BenchPowerSupply (@16,8V) it draws 1,9A full ramped and 2,5A on Turbo

any idea?

btw:
using 4 30Q BT i get 1% lower numbers in front cage, and 3% lower numbers in rear cage

[Texas_Ace]

@M4D M4X

after someplaying i found time to notice my Turbo is only 7% more Lumens (ceilingbounce in 3 locations) than full ramp

using my BenchPowerSupply (@16,8V) it draws 1,9A full ramped and 2,5A on Turbo

any idea?

btw:
using 4 30Q BT i get 1% lower numbers in front cage, and 3% lower numbers in rear cage 

Yep, exactly what it should be. 2A at the top of the ramp and 2.5A in turbo.

Lumens are not linear. They drop exponentially as power increases, which is why the ramp stops at 2A, over that you do not gain much.

You can see this is the LED test here:

[MRsDNF]

@M4D M4X

after someplaying i found time to notice my Turbo is only 7% more Lumens (ceilingbounce in 3 locations) than full ramp

using my BenchPowerSupply (@16,8V) it draws 1,9A full ramped and 2,5A on Turbo

any idea?

btw:
using 4 30Q BT i get 1% lower numbers in front cage, and 3% lower numbers in rear cage 

In testing I was barely able to see any difference between Turbo and High. From memory I measured just over 10% difference in output but that was with the proto led.
High should be 2 amps at the led and turbo 2.5 amps.

[JasonWW]

Here is MRsDNF runtime chart for 4 30Q from post #4 of the main GT thread. You can see that at 2.5A your run times suffer quite a bit (blue line). At 2A the runtimes are much better (red line). So for short usage where you need max output turbo makes sense, but for long runtimes (at almost the same output) it’s better to use 2A.

If you look at that 160 line (roughly when output starts to drop) the 2.5A reaches it in 35 minutes. The 2A reaches it in 55 minutes. At the 2A setting you get a 57% boost in run time for a tiny bit less output! I think it’s for this very reason that NarsilM v1.2 was designed to have the ramp stop short of max. (Correct me if I’m wrong)

So 2A is definitely the mode to run for practical purposes and longer run times. The 2.5A is there for max output and distance even though it drains the batteries way faster.

[square74]

after someplaying i found time to notice my Turbo is only 7% more Lumens (ceilingbounce in 3 locations) than full ramp Sad

Same to mine, but Texas_Ace is right.

Lumens are not linear.

From high 2,0A (2490lm) to turbo 2,5A (2630lm) there is only a higher output of 5,62, so 7 are not bad ;).
Or from 1,9A (about 2440lm) to 2,5A about 7,7% in your case.

If I will get open the GT, a TLF colleague will programm the driver with ramping to 100% output (2,5A) and also put a XHP35 Hi E2 3C 5000K on it.

Ramping to 100% is good for me, because I want to use ramping and I don´t like the short flicker if I will change to turbo with double click.

I know this short break (light off) is necessary, if you don´t want to flash the light in turbo for a short time, if you will use the battery level indicator or the electronical lockout.

sorry for my poor English ;).

[everydaysurvivalgear]

The XHP35HI is maxed out at around 2.5amps so you cant expect to many more lumens. Plus it depends on the binning of the LED.

[square74]

The XHP35HI is maxed out at around 2.5amps so you cant expect to many more lumens. Plus it depends on the binning of the LED.

New binning is E2 instead of D4.
Amps will be same at 2,5A.

Binning D4 is about 550lm at 85°C at 350mA and about 4,8 times more at 2500mA (2630lm, Test Texas_Ace).

I know that calculated lumen are most not correct, but I hope, that with Binning E2 I can get:
Binning E2 about 590lm at 85°C at 350mA and about 4,8 times more at 2500mA, so about 2850lm, so about 8% more lumen output and perhaps 8% more range.

that is very optimistic I know…

[Wieselflinkpro]

@square74

The XHP35HI is maxed out at around 2.5amps so you cant expect to many more lumens. Plus it depends on the binning of the LED.

New binning is E2 instead of D4.
Amps will be same at 2,5A.

Binning D4 is about 550lm at 85°C at 350mA and about 4,8 times more at 2500mA (2630lm, Test Texas_Ace).

I know that calculated lumen are most not correct, but I hope, that with Binning E2 I can get:
Binning E2 about 590lm at 85°C at 350mA and about 4,8 times more at 2500mA, so about 2850lm, so about 8% more lumen output and perhaps 8% more range.

that is very optimistic I know…

8% more lumen and sqrt(8) = 3,9 more range.

[square74]

8% more lumen and sqrt(8) = 3,9 more range.

Really?
So I don´t change the LED… and don´t need to open the flashlight.
Driver can be removed easily.

Thanks

[JasonWW]

@square74

8% more lumen and sqrt(8) = 3,9 more range.

Really?
So I don´t change the LED… and don’t need to open the flashlight.
Driver can be removed easily.

Thanks

I’m really lost on what your saying here. Are you trying to remove the driver?

If your wanting to reflash it you have room to do so without removing it. Check post #33 and you can see the room you have.

[Wieselflinkpro]

@square74

8% more lumen and sqrt(8) = 3,9 more range.

Really?
So I don´t change the LED… and don´t need to open the flashlight.
Driver can be removed easily.

Thanks

I calculated the square root of 1,08 wich is 1,039.

[square74]

I’m really lost on what your saying here. Are you trying to remove the driver?
If your wanting to reflash it you have room to do so without removing it. Check post #33 and you can see the room you have.

I don´t have know how and equipment for flashing drivers, so I removed driver and switch board and will send it to a colleague.
Driver will be reflashed with NarsilM, but with changing Ramping up to 100% (2,5A).
LEDs on switch board will be changed to blue or orange, or complete switchboard will be changed.

I like blue and orange indicator very well.

thanks.

A calculated the square root of 1,08 wich is 1,039.

Thanks Wieselflinkpro :+1:

[Wieselflinkpro]

I changed the LED of my faulty BLF GT and fitted a 2nd centering piece. I made some more pics:
German: Superthrower Lumintop BLF GT - Laberthread und Versand | Taschenlampen Forum
English: Superthrower Lumintop BLF GT - Laberthread und Versand | Taschenlampen Forum
Picture-Galery:BLF GT | Taschenlampen Forum

[M4D_M4X]

nice idea with that centering piece!

Danke fürs zeigen!

[Wieselflinkpro]

@M4D M4X

nice idea with that centering piece!

Danke fürs zeigen!

I have seen it somewhere in the GT-Thread.
I am the second who showed it.