BLF GT (preliminary) modding thread

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djozz
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Firelight2 wrote:
djozz wrote:
p=.
That looks like it would be PAINFUL if you try groping around for it in the dark and accidentally grab the wrong thing. Evil

Yes, and there’s more of them in the house, my son is particularly fond of cactuses. You just gave me an argument to sell the flashlight hobby to the family Smile

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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Hi,

i did the first steps with my BLF GTA (Giga Thrower aspheric) Crown Aiming to kick the Optofires ass which uses a 120mm lens as well. The light already fires up, but is bad focussed at the moment. Quick and dirty put together for a first measurement. I measured 1.7 Mcd (8metres) already – without the Wavien Collar.

Greetings

Kenjii

djozz
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The battle of the throwers! Evil

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

KawiBoy1428
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This looks so cool Thumbs Up

Reminds me of the movie War of the Worlds

KB1428 “Live Life WOT”

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Been thinking of what kind of mods for this light and started to wonder what kind of IR LEDs are available these days that would work well with the GT.
Anyone else looked into this as of yet? If so, what kind of thought/research have you done? Any IR LEDs compatible with enough output to make it viable?

Enderman
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Kenjii wrote:
Hi,

i did the first steps with my BLF GTA (Giga Thrower aspheric) Crown Aiming to kick the Optofires ass which uses a 120mm lens as well. The light already fires up, but is bad focussed at the moment. Quick and dirty put together for a first measurement. I measured 1.7 Mcd (8metres) already – without the Wavien Collar.

Greetings

Kenjii


Hahaha that looks sick Big Smile

Good luck, cause you’re gonna have to compete with my extreme cooling setup Silly

AlexGT
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Hey TA, sent you a PM about one of your GT XHP-70.2 Drivers, Interested in one!

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Enderman wrote:
Kenjii wrote:
Hi,

i did the first steps with my BLF GTA (Giga Thrower aspheric) Crown Aiming to kick the Optofires ass which uses a 120mm lens as well. The light already fires up, but is bad focussed at the moment. Quick and dirty put together for a first measurement. I measured 1.7 Mcd (8metres) already – without the Wavien Collar.

Greetings

Kenjii


Hahaha that looks sick Big Smile

Good luck, cause you’re gonna have to compete with my extreme cooling setup Silly

I think the cooling is not siginificantly worse in the GT, we are talking about ~20W only Wink And I power my LED with only 5A current.

The beam is very very tight… really cool.

djozz
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Kenji, out of curiosity, where did you find a lens of the right diameter and also with (about,I see cardboard bits) correct focal length? Or were you lucky?

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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Kenjii wrote:
Enderman wrote:
Kenjii wrote:
Hi,

i did the first steps with my BLF GTA (Giga Thrower aspheric) Crown Aiming to kick the Optofires ass which uses a 120mm lens as well. The light already fires up, but is bad focussed at the moment. Quick and dirty put together for a first measurement. I measured 1.7 Mcd (8metres) already – without the Wavien Collar.

Greetings

Kenjii


Hahaha that looks sick Big Smile

Good luck, cause you’re gonna have to compete with my extreme cooling setup Silly

I think the cooling is not siginificantly worse in the GT, we are talking about ~20W only Wink And I power my LED with only 5A current.

The beam is very very tight… really cool.


What about the weight increase?
djozz
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weight increase: check, accomplished. Wink

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

Kenjii
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djozz wrote:
Kenji, out of curiosity, where did you find a lens of the right diameter and also with (about,I see cardboard bits) correct focal length? Or were you lucky?

I was lucky because this was the only suitable lens left by Enderman at Optolife Big Smile He chose the A380 lens from optolife and i bought the only one left A037. Focal length 115mm which was almost perfect for the GT from the first drawings (reflector height 120mm). So i bought this last lens in stock some months ago.

Size does matter but weight…. LOL

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Kenjii wrote:

I think the cooling is not siginificantly worse in the GT, we are talking about ~20W only Wink And I power my LED with only 5A current.

The beam is very very tight… really cool.


Lower temperature = higher output, even if the LED is very low wattage Smile
That’s why I used a CPU heatsink, cooling fan, and liquid metal, so that I could run my Black Flat up to 6A without a decrease in output.

Kenjii wrote:

I was lucky because this was the only suitable lens left by Enderman at Optolife Big Smile He chose the A380 lens from optolife and i bought the only one left A037. Focal length 115mm which was almost perfect for the GT from the first drawings (reflector height 120mm). So i bought this last lens in stock some months ago.

Size does matter but weight…. LOL


Who knows, maybe they produced a few more.
When I bought mine from them a year ago it still said 0 stock on the website but when I contacted them they said they had some Silly
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djozz wrote:
p=.

Today I’m going to try to improve my GT. It under-performs by quite a margin, …


Mine underperforming too. I even charged my 8 sanyo GA batteries to 4,23V to make a difference but I can’t go above 981000 Cd. My reflector also not the best this year’s batch.
Today I got a friend’s GT and I will measure it too if it make more candelas.
I also got an Opofire 120mm lens and with a dedomed XP-G2 I got 1,7 MCd with 1 cell at 4,5A.
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ZozzV6 wrote:
djozz wrote:
p=.

Today I’m going to try to improve my GT. It under-performs by quite a margin, …


Mine underperforming too. I even charged my 8 sanyo GA batteries to 4,23V to make a difference but I can’t go above 981000 Cd. My reflector also not the best this year’s batch.
Today I got a friend’s GT and I will measure it too if it make more candelas.
I also got an Opofire 120mm lens and with a dedomed XP-G2 I got 1,7 MCd with 1 cell at 4,5A.

What distance are you measuring it at? The humidity in the air, dust and a bunch of other things can have big effects on the readings with lights this powerful.

On my own GT depending on the day and distance I have gotten readings ranging from 800kcd up to 1.17Mcd, all with the exact same light.

djozz
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Texas_Ace wrote:
ZozzV6 wrote:
djozz wrote:
p=.

Today I’m going to try to improve my GT. It under-performs by quite a margin, …


Mine underperforming too. I even charged my 8 sanyo GA batteries to 4,23V to make a difference but I can’t go above 981000 Cd. My reflector also not the best this year’s batch.
Today I got a friend’s GT and I will measure it too if it make more candelas.
I also got an Opofire 120mm lens and with a dedomed XP-G2 I got 1,7 MCd with 1 cell at 4,5A.

What distance are you measuring it at? The humidity in the air, dust and a bunch of other things can have big effects on the readings with lights this powerful.

On my own GT depending on the day and distance I have gotten readings ranging from 800kcd up to 1.17Mcd, all with the exact same light.

I think the question was directed at ZozzV6, still here is how we measured our GT’s: in the hallway of Nico’s cellar, at 13 meter and 23 meter (if I remember it well), the results did not differ much so I do not expect the throw to suddenly go up by much if measured further. The difference between Nico’s GT and mine next to each other was clear and significant (1.16kcd vs 875kcd).

But I’m a happy camper already, with your driver and XHP70.2 led I will have a fine modding project ahead Smile

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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I measured it at multiple distances outdoor. My lux numbers are the following:
10m: 9810 lux
15m: 4290 lux
20m: 2270 lux
25m: 1522 lux

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ZozzV6 wrote:
I measured it at multiple distances outdoor. My lux numbers are the following:
10m: 9810 lux
15m: 4290 lux
20m: 2270 lux
25m: 1522 lux

Check your Candela, from 20m to 25m it jumps back up..http://www.rapidtables.com/calc/light/lux-to-candela-calculator.htm

KB1428 “Live Life WOT”

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KawiBoy1428 wrote:
ZozzV6 wrote:
I measured it at multiple distances outdoor. My lux numbers are the following:
10m: 9810 lux
15m: 4290 lux
20m: 2270 lux
25m: 1522 lux

Check your Candela, from 20m to 25m it jumps back up..http://www.rapidtables.com/calc/light/lux-to-candela-calculator.htm

All distances give a similar throw, under 1Mcd.

And I think that given how often he does lux measurements that ZozzV6 has an idea how well his numbers compare to other numbers around, so a faulty luxmeter or one with calibration way off can also be ruled out.

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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djozz wrote:
And I think that given how often he does lux measurements that ZozzV6 has an idea how well his numbers compare to other numbers around, so a faulty luxmeter or one with calibration way off can also be ruled out.

I have done a few Big Smile
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I noticed the hotspot of my GT is smaller than the hotspot of my Palight Boss. Strange, the GT has a dedomed XHP 35 and the Boss has a dedomed X-PL. I bet it is out of focus, but it is impossible to unscrew the head of the LED section. I will post an update IF I ever manage to unscrew it and change the focus height

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I know most of this thread is geared more towards drivers and LEDs, but for a filthy casual type like myself… I’m going to ask the obvious – has anyone made an adapter to put a BLF Q8 on the ass end of the GT? The diameter and thread pitch are obviously different, and there’s no real need for it other than having a long range focused light on one end and a monster floodlight on the other. Forgive me if this is totally ridiculous, my GT showed up yesterday and when taking pictures next to my Q8 for comparison the idea punched me in the back of the head. Or maybe it’s the pain meds from a recent surgery to reattach a muscle, not sure.

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johny723 wrote:
I noticed the hotspot of my GT is smaller than the hotspot of my Palight Boss.

That’s what happens when you put a larger reflector in a flashlight.
johny723
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I tried adding spacers under the centering disc. All it did was a donut hole in the beam, without making it bigger or more focused.

It still seems to me the GT hotspot is not as focused as it could be. There is simply too much light wasted around the hotspot. Or at least I think so. Can it be changed or not?

Has anyone tried a thinner centering piece?

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johny723 wrote:
I tried adding spacers under the centering disc. All it did was a donut hole in the beam, without making it bigger or more focused.

It still seems to me the GT hotspot is not as focused as it should be. There is simply too much light wasted around the hotspot. Or at least I think so. Can it be changed or not?

Has anyone tried a thinner centering piece?


The hotspot of my GT looks pretty focussed but when over 10 meter it is slightly darker in the middle. I’m not sure if that is the nature of the XHp35 Hi led or that the focus is less than perfect, in which case the centerpiece should be a bit thinner. I dare not sanding it down yet in case it makes things worse instead of better.

Btw, on the list of parts that would be welcomed to be sold separately should be the centerpiece IMO.

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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And apart from being slightly darker in the centre there is a lot of light around the hotspot that could be used in the middle. If it is even possible.

To be precise, I made 3 shims with a total height of 0,5mm and tried adding them under the black centering disc one by one, but the donut hole was bigger with every added shim.

Someone should make thinner centerpieces, I don’t have guts to sand down mine.

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^

Here is a great thread on how to easily check your light for focus:

http://budgetlightforum.com/node/55428

 

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johny723 wrote:
And apart from being slightly darker in the centre there is a lot of light around the hotspot that could be used in the middle. If it is even possible.

To be precise, I made 3 shims with a total height of 0,5mm and tried adding them under the black centering disc one by one, but the donut hole was bigger with every added shim.

Someone should make thinner centerpieces, I don’t have guts to sand down mine.

I remember DB Custom thinned his center piece a bit by sanding. He posted about it, with pictures; back somewhere in all the massive & many GT threads & posts. If I can find it, I’ll post a link.

IIRC, he said in his case it helped tweak the focus a bit tighter.

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DB Custom can work miracles in comparison with me, I already got the idea of sanding the centerpiece down, but it is beyond my skills to do it properly. My centerpiece would be thinner on one end and thicker on the other, apart from many other blemishes I would cause, and that would not help the focusing at all.

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johny723 wrote:
I noticed the hotspot of my GT is smaller than the hotspot of my Palight Boss. Strange, the GT has a dedomed XHP 35 and the Boss has a dedomed X-PL. I bet it is out of focus, but it is impossible to unscrew the head of the LED section. I will post an update IF I ever manage to unscrew it and change the focus height

Hi. Is your palight boss have a ring around the hotspot?

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