[PART 1] Official BLF GT Group Buy thread. Group buy officially closed! Lights shipping.

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ARsee
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BrianK wrote:
Ideally the handle should be made of plastic. As was previously written, holding aluminum in the winter rapidly cures one of the urge.

That's exactly the reason for this link

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Momo wrote:
Please add me to the list for the GT light.
Thanks

Coyotehawk will add your name to his sign up list. You’ll see your name when he does the next update. It will be sometime mid January when you are emailed with the details of where to go and how to order.

You can also buy 8 of the Samsung 35E batteries for $40 at the same time as you buy the light. No sign up necessary for those. There are plenty of batteries in stock. 

Welcome to BLF.

Juandre wrote:
Does anybody know where i can get a blf gt (giggle thrower)

You are already on the list for one light.

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BrianK
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ARsee wrote:

BrianK wrote:
Ideally the handle should be made of plastic. As was previously written, holding aluminum in the winter rapidly cures one of the urge.

That’s exactly the reason for this link

R/C I didn’t see a link.
nodoubt
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alex1234 wrote:
Something iv been wondering is the Blf GT under driven? I have a current boosted Bkf09s that has ceiling bounce of 190 and with the GT I only get 145 max. I know larger reflectors have more reflector loss but it should not be that much. This tells me this led can be boosted a decent amount
Thoughts?

same here alex
seems mine is a tad under driven also
i get 240 all day long on my tn42
both my gt lights get exactly 200, every single time
same xhp35, both lights very deep reflectors
i would rather mine be a tad over driven, and have to back it off manually, when the heat got a tad strong
ARsee
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BrianK wrote:
ARsee wrote:

BrianK wrote:
Ideally the handle should be made of plastic. As was previously written, holding aluminum in the winter rapidly cures one of the urge.

That's exactly the reason for this link

R/C I didn't see a link.

Search Google for "Universal Grab Handle"

I think this type of handle would be the best for the application. Anti-scratch, adjustable, universal for other throwers, easily stowed flat, comfortable...etc. YMMV smile

JasonWW
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alex1234 wrote:
Something iv been wondering is the Blf GT under driven? I have a current boosted Bkf09s that has ceiling bounce of 190 and with the GT I only get 145 max. I know larger reflectors have more reflector loss but it should not be that much. This tells me this led can be boosted a decent amount
Thoughts?

There is more info in this link.
http://budgetlightforum.com/comment/1249634#comment-1249634

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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AlexGT
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Maybe it was discussed before, but let me ask, for the people that already have the GT…

Where is the balance point (Center of mass) in the GT?

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AlexGT wrote:
Maybe it was discussed before, but let me ask, for the people that already have the GT…

Where is the balance point (Center of mass) in the GT?


With 4 cells at the rear, it is at the switch. Maybe the back half of the switch.

I would guess that with 8 cells it would be right at the blf gt logo.

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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Texas_Ace
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nodoubt wrote:
alex1234 wrote:
Something iv been wondering is the Blf GT under driven? I have a current boosted Bkf09s that has ceiling bounce of 190 and with the GT I only get 145 max. I know larger reflectors have more reflector loss but it should not be that much. This tells me this led can be boosted a decent amount Thoughts?
same here alex seems mine is a tad under driven also i get 240 all day long on my tn42 both my gt lights get exactly 200, every single time same xhp35, both lights very deep reflectors i would rather mine be a tad over driven, and have to back it off manually, when the heat got a tad strong

The LED in the GT is overdriven already. It is run at 2.5A in turbo which is about as high as is practical before rapidly diminishing returns.

You could swap the sense resistor and raise it to 3A if you really wanted but you would only gain a small amount for the first little bit until the LED heated up.

The biggest reason for the lower readings then other lights is that the GT is using a Neutral white 4000k emitter vs the CW ~6500k emitter in most other lights.

The lux meters we use are biased to the cooler white range and will artificially inflate those numbers.

The stock LED is a D4 bin. The highest bin that Cree lists in the data sheet is E2, which is 1 bin above D4. Or about 7% higher output. So 7% higher is about the most you can expect with another LED, everything else should be the meter bias.

Pulsar
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Ceiling bounce is not a very good way to judge lumen output, its not going to be very accurate

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Pulsar wrote:
Ceiling bounce is not a very good way to judge lumen output, its not going to be very accurate

This is another point, the concentrated beam of the GT could also effect the way the light bounced and cause less light to reflect at all, skewing your readings further.

Basically the LED in the GT is driven as hard as is practical for a production light, harder then most other lights, including the tn42 (it is driven at 2.25A IIRC). So you won’t get much more out of another LED, I wish we could. The only real improvement is going with an E2 bin LED for a 7% improvement. Which we could not source for the GT due to a shortage of NW E2 LED’s.

BrianK
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R/C I googled it and bing kept coming up.

http://www.bing.com/search?q=Universal%20Grab%20Handle&pc=cosp&ptag=C1N1...

which handle did you have in mind?

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Im number 1186 on the list. I would like to order a 2nd one if possible. Thanks

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hron61 wrote:
Im number 1186 on the list. I would like to order a 2nd one if possible. Thanks

Two posts. Two GT’s. That’s an amazing track record so far.

nodoubt
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Sirius9 wrote:
Pulsar wrote:
If I remember right, there was a SupFire light that had a handle that mounted to the tripod thread

Niteye EYE30/40 had this! 25$(+ shipping)<-click the pic…!

that looks perfect!
wonder it the threads will match up ?
sunfire
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Damn, I’m going to regret joining this forum real soon ( I got my first LED flash light only ~ 2 months ago, a brand new old stock TN32, got me addicted to LED flash lights already Big Smile ). Please put me down for a 2nd GT ( even if I didn’t get the first one yet Big Smile ), I should be already in the list somewhere around the position number 11xx .

PS: Happy New Year to everybody ! I wish everybody and their close ones to be healthy, the rest is bonus Big Smile

BrianK
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A happy and healthy 2018 right back at you sunfire!

Yeah, there are no membership fees on this site, but it will still cost you some money from FAD (flashlight acquisition disorder).

ARsee
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BrianK wrote:
R/C I googled it and bing kept coming up. http://www.bing.com/search?q=Universal%20Grab%20Handle&pc=cosp&ptag=C1N1... which handle did you have in mind?

Sorry BrianK, I was working on an animation.

The search was a "general" search for a velcro strap-type, that wraps around the battery tube at two points. Mainly as ideas from products made for other things. If you look at the images there are universal grab handles available that are used in off-road vehicles, as grab handles. They are adjustable for 2"-3" diameters, and would wrap nicely on the battery tube of the GT, I think.

My idea may not be for everyone. I was merely trying to help find what's readily available, and share my findings.

 

EDIT, Your search is done through "Bing". I searched through "Google". When you search for Universal Grab Handle, check images to see what's available.

This is a Universal Grab Handle. There are many types and styles available.

 

 

alex1234
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Texas_Ace wrote:
Pulsar wrote:
Ceiling bounce is not a very good way to judge lumen output, its not going to be very accurate

This is another point, the concentrated beam of the GT could also effect the way the light bounced and cause less light to reflect at all, skewing your readings further.

Basically the LED in the GT is driven as hard as is practical for a production light, harder then most other lights, including the tn42 (it is driven at 2.25A IIRC). So you won’t get much more out of another LED, I wish we could. The only real improvement is going with an E2 bin LED for a 7% improvement. Which we could not source for the GT due to a shortage of NW E2 LED’s.

That makes sense to me. Thanks. I found it impressive that i still hit 1.2 million cd even with a NW emitter. I wonder what it would read with a led closer to cool white. my meter is crazy bias to cool white leds for measuring throw. but i LOVE the NW emitter so ill leave it as is. That is till i can get a CFT 90 in there. 5000 lumens and 1.6 ish million cd sounds amazing(just a guess). it wont be cheap but if a driver can be made for it to drive it to its max potential im all in.

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Back home from the holiday and I got to take my light out. Man this is the brightest beam I have seen. I have a nice light on my boat but this thing is crazy! I have two questions for the group.

What is the life expectancy of the LED?

Has anyone figured the illuminated circle diameter at a given distance?

Thanks

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Bozlight29 wrote:

Let’s hope that the European GT’s ship this week and Lumintop doesn’t wait for the second round of $150 GT’s to combine the shipment. 


Lumintop should ship Asean’s GT first after USA’s GT.
Just kiddng… Big Smile Beer

cool i'll see you when you get there

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I tried a variety of methods to get the bezel off (clamp in vise, twist with hands, press down on rubber or leather, twist with hands), but I guess my hands are not strong enough. I think I’ll buy two rubber strap wrenches (like in the picture below) and twist in opposite directions. If that doesn’t work, I don’t know what will.

Maybe we could tell the factory to lower the torque settings on the head and bezel. They are tight to the point it feels glued. I know there’s no glue, but wow is it tight. There’s no need for it to be this tight.

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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I have a pair of gloves rated for high temps, for cooking on the BBQ, and they work amazingly well for removing jar lids. When my GT's arrive I'll try them.

If you have a pair, clean them up real good to remove any grease, dry them out good, clamp that light back in the vise, and try it.

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Looks like many will open their GT to let the smoke out for first few days or weeks Big Smile
I migth do that too. Facepalm

cool i'll see you when you get there

JasonWW
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My hands didn’t slip, my arms just did not have the strength to twist it. The strap wrenches extend the diameter and give more leverage. That should get it done.

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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mrheosuper wrote:
We should make an account and there will be a team manage that account. In case someone has their own thing to do
ARsee wrote:

Will someone please “list” for me, ALL “Team Members & Affiliation” involved in the BLF project.


MRsDNF
Tom E
DEL
The Miller
Thijsco19
Texas_Ace
Neal
M4DM4X


 



sb56637
Mr.Scott
JasonWW
Coyotehawk
teacher
Fritz15
djozz
ToyKeeper


 


Neal – Valuable collaborator
Outside the team?

Texas_Ace wrote:
Yes, from now on the projects should use a Team account to handle all thread making to keep issues like this from happening again.

For now, the issue is that even if we make a new thread most will not find it or read it but the Team will have to read and keep track of both threads.

I don’t see it fixing a lot of issues at this point but it would add a lot of work.

Sorry for my bad English
(google translator) , (https://www.deepl.com/translator)

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DENGOH wrote:
Looks like many will open their GT to let the smoke out for first few days or weeks Big Smile
I migth do that too. Facepalm

I think KawiBoy1428 was the only one that had any smoke (on only one of his two lights). Mine didn’t. I haven’t heard anyone else say they had smoke (from excess flux residue). Hopefully if anyone else sees it, they will mention it.

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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I wonder is there method to make all the material dried or settled so that they don’t smoke, for example switch on in High mode for a few days before using Turbo mode. Really don’t feel like to open a newly bought flashlight unless I want to mod it to improve it. But GT is already very very hard driven.

cool i'll see you when you get there

xCentrino
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ARsee wrote:

I have a pair of gloves rated for high temps, for cooking on the BBQ, and they work amazingly well for removing jar lids. When my GT’s arrive I’ll try them.


If you have a pair, clean them up real good to remove any grease, dry them out good, clamp that light back in the vise, and try it.

Opening the GT is the new test of strength. I gonna bare hand it. Big Smile Davie

DENGOH
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JasonWW wrote:
DENGOH wrote:
Looks like many will open their GT to let the smoke out for first few days or weeks Big Smile
I migth do that too. Facepalm

I think KawiBoy1428 was the only one that had any smoke (on only one of his two lights). Mine didn’t. I haven’t heard anyone else say they had smoke (from excess flux residue). Hopefully if anyone else sees it, they will mention it.

I think the chance is high that some might miss seeing the smoke as it is tough to look into the reflector with Turbo mode on or it was dark outside when they switch off to check the reflector. Sure that many switch on Turbo indoor too, but i think most will not switch it on Turbo long enough because it is very hard to look at the hotspot on wall.

Anyway, the smoke might not cause detrimental damage or leave any visible marks if it is not very serious smoking. I just want to have some precautions about it.

cool i'll see you when you get there

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