BLF GT (preliminary) modding thread

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Lfatman
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This is the Led with the centering disc raised. Some dust after disassembling and assembling 50 times.

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I blow the reflectors off with compressed air in situations like that and 90% of the time that is all that is needed.

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I also use keyboard cleaning compressed air, but it’s over. I need to buy more.

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To answer some questions.
I noticed if the reflector focused well and I’m getting the best numbers at 25-30m distance it will have a donut hole at 10-20m. If you get the highest lux readings at 10m then the light is over focused and even if you got high lux readings it will not throw as far as you calculate and it is noticable by eye. When I had a very tight hot spot at 10m the lux readings were lower than if I saw a little more corona and not very tight hot spot. Because of the reflector size this light need to measure at least 20-25m.
Earlier I saw that the beam looks like a cone as it going farther but now it looks wider and two days ago we had come clouds and I could see the hot spot touching them Big Smile

I opened the second GT yesterday and started with 3,3mm thickness centering ring. I only had time to measure this setup. This light earlier got 894 kcd with stock 2,5mm centering thickness. with 3,3mm I got 926kcd still best reading at 10m so maybe I need to go much higher in thickness than my light.

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Measured at 10m, 15m and 20m after 30 seconds.

10m 1.237.000Cd

15m 1.284.750Cd

20m 1.272.000Cd

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Great numbers! Thumbs Up

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Texas_Ace wrote:
I blow the reflectors off with compressed air in situations like that and 90% of the time that is all that is needed.

I did that for a while as well. In the meantime i read that compressed air contains a small amounts of oil. So i wouldn´t recommend this any more.

Regards

Kenjii

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Kenjii wrote:
Texas_Ace wrote:
I blow the reflectors off with compressed air in situations like that and 90% of the time that is all that is needed.

I did that for a while as well. In the meantime i read that compressed air contains a small amounts of oil. So i wouldn´t recommend this any more.

Regards

Kenjii

Oil is generally only if you have an oil canister in the air line that is supposed to add oil to the air to lubricate tools.

If you do not have that then it will generally be pretty clean. It can have some water in the line if it has not been cleaned out regularly but if you spray it on the ground at first to clean out the line I have not had any issues.

That said if you want to be sure, just use a can of compressed air, it works just as good but costs more. If it the best option anyways, you know it will be clean.

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Hi all,

I did an XHP70.2 swap. Its a de-dome and I also changed the driver to a mosfet. Came out pretty well. It’s got about the same range as before but over 8,000 lumens.


.
.
Since I had a total of 4 lights here I also did a few control tests.

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Thanks for the nice comparison, the XHP70.2 mod (with TA driver) is in the planning for my GT also so I’m glad to see it performing so well.

About the lux-readings: I recently (link) compared the LX1330B luxmeter (which is the one I think I see you using) to my high end Mobilux meter (which should be as accurate as you can possibly buy in a portable meter) and my LX1330B meter at least reads the cool white 70CRI XM-L2 in my Sunwayman D40A 9% too high, and a (70CRI) 4500K led 7.5% too low. That is 16.5% apart, so the spectral error of the LX1330B alone could already account for the reading difference that you find between the cool and neutral XHP35 Hi emitters in your GT’s.

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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vestureofblood wrote:
Hi all,

I did an XHP70.2 swap. Its a de-dome and I also changed the driver to a mosfet. Came out pretty well. It’s got about the same range as before but over 8,000 lumens.


.
.
Since I had a total of 4 lights here I also did a few control tests.
!https://s7.postimg.cc/ct15dmkyj/test.png!

Great video and great results! Good to see my own numbers are backed up, yours are a lot better then mine actually.

Hopefully this should help lumintop see that making the XHP70.2 mcpcb is a worthwhile investment.

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djozz wrote:
Thanks for the nice comparison, the XHP70.2 mod (with TA driver) is in the planning for my GT also so I’m glad to see it performing so well.

About the lux-readings: I recently (link) compared the LX1330B luxmeter (which is the one I think I see you using) to my high end Mobilux meter (which should be as accurate as you can possibly buy in a portable meter) and my LX1330B meter at least reads the cool white 70CRI XM-L2 in my Sunwayman D40A 9% too high, and a (70CRI) 4500K led 7.5% too low. That is 16.5% apart, so the spectral error of the LX1330B alone could already account for the reading difference that you find between the cool and neutral XHP35 Hi emitters in your GT’s.

Yes, I have noticed these same things and about the same ratios on the cheap meters. The readings themselves are pretty good but they most certainty are effected by tint.

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I have Anduril working on the BLF GT, in case that’s a thing anyone is interested in. Basic usage is very similar, but it has extra features compared to the original firmware. Granted, some of the extras are less relevant on a big thrower than they are on EDC-style lights, but some are still pretty useful.

Just thought I should mention it since it’s relevant to the topic.

This also means it should be pretty easy to get other interfaces running on the GT, since the library supports the hardware now.

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ToyKeeper wrote:
I have Anduril working on the BLF GT, in case that’s a thing anyone is interested in. Basic usage is very similar, but it has extra features compared to the original firmware. Granted, some of the extras are less relevant on a big thrower than they are on EDC-style lights, but some are still pretty useful.

Just thought I should mention it since it’s relevant to the topic.

This also means it should be pretty easy to get other interfaces running on the GT, since the library supports the hardware now.

Yes, this is on my to do list once I finish some other projects. I really want to play with Anduril just have not had time.

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Eventually my GT will be running a XHP70.2 but I’m waiting for Lumintop or possibly led4power to come out with a dedicated 12V GT-XHP70.2 ledboard before that can happen.

In the meantime I received a (actually two) new XHP35 Hi emitter, in a nice 4000K 80CRI tint output bin C4 from Kaidomain, and to check if my severely underperforming GT (830 kcd) was suffering from a bad led, I swapped it with this new one.

And behold!, it solved the problem. Measured at 12 meter distance, on 30Q’s (shorty setup with one bsttery carrier) after 30 seconds my GT now does 1.0 Mcd (998.7kcd Silly ). Assuming that the stock GT’s have a higher D4 binned led (should on average read 1.15 times higher), this is perfectly in line now with the numbers that we measured from Nico’s GT.

And FWIW, like all other 4000K 80 CRI leds that I used from Cree in the last year, the tint is really really great!

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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Good to hear djozz!
Now the third GT also arrived to me to play with focus. The second which done only 870 kcd was worse than mine so it need to go to 3,5mm or above with centering plate thickness. I haven’t opened the third yet. and I haven’t got a lot time but I will sum up the conclusion when finished with all three and got the best results.

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djozz wrote:
Thanks for the nice comparison, the XHP70.2 mod (with TA driver) is in the planning for my GT also so I’m glad to see it performing so well.

About the lux-readings: I recently (link) compared the LX1330B luxmeter (which is the one I think I see you using) to my high end Mobilux meter (which should be as accurate as you can possibly buy in a portable meter) and my LX1330B meter at least reads the cool white 70CRI XM-L2 in my Sunwayman D40A 9% too high, and a (70CRI) 4500K led 7.5% too low. That is 16.5% apart, so the spectral error of the LX1330B alone could already account for the reading difference that you find between the cool and neutral XHP35 Hi emitters in your GT’s.

That is really a useful bit if information. I appreciate you letting us know. I suspected as much bet never took the time to try and prove it. I think I will take a look at some better meters soon…

In Him (Jesus Christ) was life; and the life was the light of men. And the light shineth in darkness; and the darkness comprehended it not.
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vestureofblood wrote:
djozz wrote:
Thanks for the nice comparison, the XHP70.2 mod (with TA driver) is in the planning for my GT also so I’m glad to see it performing so well.

About the lux-readings: I recently (link) compared the LX1330B luxmeter (which is the one I think I see you using) to my high end Mobilux meter (which should be as accurate as you can possibly buy in a portable meter) and my LX1330B meter at least reads the cool white 70CRI XM-L2 in my Sunwayman D40A 9% too high, and a (70CRI) 4500K led 7.5% too low. That is 16.5% apart, so the spectral error of the LX1330B alone could already account for the reading difference that you find between the cool and neutral XHP35 Hi emitters in your GT’s.

That is really a useful bit if information. I appreciate you letting us know. I suspected as much bet never took the time to try and prove it. I think I will take a look at some better meters soon…

Thrunite TN42 CW vs BLF GT NW.
Measured lux reading at 10 meter distance using UT383 cheap lux meter.

Hardusvd70

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Hardusvd70 wrote:
vestureofblood wrote:
djozz wrote:
Thanks for the nice comparison, the XHP70.2 mod (with TA driver) is in the planning for my GT also so I’m glad to see it performing so well.

About the lux-readings: I recently (link) compared the LX1330B luxmeter (which is the one I think I see you using) to my high end Mobilux meter (which should be as accurate as you can possibly buy in a portable meter) and my LX1330B meter at least reads the cool white 70CRI XM-L2 in my Sunwayman D40A 9% too high, and a (70CRI) 4500K led 7.5% too low. That is 16.5% apart, so the spectral error of the LX1330B alone could already account for the reading difference that you find between the cool and neutral XHP35 Hi emitters in your GT’s.

That is really a useful bit if information. I appreciate you letting us know. I suspected as much bet never took the time to try and prove it. I think I will take a look at some better meters soon…

Thrunite TN42 CW vs BLF GT NW.
Measured lux reading at 10 meter distance using UT383 cheap lux meter.
https://imgur.com/gallery/qot1TjG
!{height:400px; width:500px}https://imgur.com/gallery/qot1TjG!

Very nice, pretty much right in line with what I would expect.

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Texas_Ace wrote:
Hardusvd70 wrote:
vestureofblood wrote:
djozz wrote:
Thanks for the nice comparison, the XHP70.2 mod (with TA driver) is in the planning for my GT also so I’m glad to see it performing so well.

About the lux-readings: I recently (link) compared the LX1330B luxmeter (which is the one I think I see you using) to my high end Mobilux meter (which should be as accurate as you can possibly buy in a portable meter) and my LX1330B meter at least reads the cool white 70CRI XM-L2 in my Sunwayman D40A 9% too high, and a (70CRI) 4500K led 7.5% too low. That is 16.5% apart, so the spectral error of the LX1330B alone could already account for the reading difference that you find between the cool and neutral XHP35 Hi emitters in your GT’s.

That is really a useful bit if information. I appreciate you letting us know. I suspected as much bet never took the time to try and prove it. I think I will take a look at some better meters soon…

Thrunite TN42 CW vs BLF GT NW.
Measured lux reading at 10 meter distance using UT383 cheap lux meter.
https://imgur.com/gallery/qot1TjG
!{height:400px; width:500px}https://i.imgur.com/ouGh5Ng.jpg!


!{height:400px; width:500px}https://i.imgur.com/ZzA9vqi.jpg!

Very nice, pretty much right in line with what I would expect.[/quote]

Hardusvd70

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Texas_Ace wrote:
Hardusvd70 wrote:
vestureofblood wrote:
djozz wrote:
Thanks for the nice comparison, the XHP70.2 mod (with TA driver) is in the planning for my GT also so I’m glad to see it performing so well.

About the lux-readings: I recently (link) compared the LX1330B luxmeter (which is the one I think I see you using) to my high end Mobilux meter (which should be as accurate as you can possibly buy in a portable meter) and my LX1330B meter at least reads the cool white 70CRI XM-L2 in my Sunwayman D40A 9% too high, and a (70CRI) 4500K led 7.5% too low. That is 16.5% apart, so the spectral error of the LX1330B alone could already account for the reading difference that you find between the cool and neutral XHP35 Hi emitters in your GT’s.

That is really a useful bit if information. I appreciate you letting us know. I suspected as much bet never took the time to try and prove it. I think I will take a look at some better meters soon…

Thrunite TN42 CW vs BLF GT NW.
Measured lux reading at 10 meter distance using UT383 cheap lux meter.
https://imgur.com/gallery/qot1TjG
!{height:400px; width:500px}https://imgur.com/gallery/qot1TjG!

Very nice, pretty much right in line with what I would expect.


The reading of the BLF GT is still around 13% under when measuring neutral white color with this type of lux meter. Adding this error will then give around 1.141 real Mcd intensity.

Hardusvd70

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Hardusvd70][quote=Texas_Ace wrote:
Hardusvd70 wrote:
vestureofblood wrote:
djozz wrote:
Thanks for the nice comparison, the XHP70.2 mod (with TA driver) is in the planning for my GT also so I’m glad to see it performing so well.

About the lux-readings: I recently (link) compared the LX1330B luxmeter (which is the one I think I see you using) to my high end Mobilux meter (which should be as accurate as you can possibly buy in a portable meter) and my LX1330B meter at least reads the cool white 70CRI XM-L2 in my Sunwayman D40A 9% too high, and a (70CRI) 4500K led 7.5% too low. That is 16.5% apart, so the spectral error of the LX1330B alone could already account for the reading difference that you find between the cool and neutral XHP35 Hi emitters in your GT’s.

That is really a useful bit if information. I appreciate you letting us know. I suspected as much bet never took the time to try and prove it. I think I will take a look at some better meters soon…

Thrunite TN42 CW vs BLF GT NW.
Measured lux reading at 10 meter distance using UT383 cheap lux meter.
https://imgur.com/gallery/qot1TjG

!{height:400px; width:500px}https://imgur.com/gallery/qot1TjG!

Very nice, pretty much right in line with what I would expect.


Using another type of lux meter. Lux measured at 10 meter distance.

Hardusvd70

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..a man with one watch knows what time it is…

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:
..a man with one watch knows what time it is…

Oh how this applies to lux meters and taking readings from flashlights in general.

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Texas_Ace wrote:
djozz wrote:
..a man with one watch knows what time it is…

Oh how this applies to lux meters and taking readings from flashlights in general.


That commend is so true.

Hardusvd70

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djozz wrote:
..a man with one watch knows what time it is…
PartyPartyParty
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Made the GT centering ring in 3D and I made different thickness models. I will 3D print them and try the 3 GT soon. Sorry but I had a lot to do around the house.

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Looking good ZozzV6!! . Thumbs Up

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I made the centering things in the following thicknesses in mm:
3.0
3.1
3.2
3.3
3.4
3.5
3.6
I need a few days for testing because I start night shifts today and I only home at daylight.

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AlexGT wrote:
I want to see a XHP-70.2 on it! It should still throw like crazy at least farther than my eyes can see anyway with lots of lumens to spare Cool
I have a BLF GT-70.2 and in my eyes the throw is not what shocks me. About 200 to 400 yards is hard for my eyes to determine throw, but not brightness.

A palm tree that I shot with my TN42 vn had a small tight circle of light on it (at the leaves) with the Thrunite TN42 vn. The same palm tree with the BLF GT-70 is in daylight the entire palm tree and houses and everything….. I mean 200 to 400 yards away in daylight….. It’s crazy…..
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