BLF GT (preliminary) modding thread

Before anyone jumps in

I CALL DIBS ON ONE BLF GT XHP70.2 DRIVER!!!

PayPal ready, just let me know when you are ready to sell.

Thanks!
:partying_face:

TA- before you sell one, please post some beamshots of that 9k lumen monster!

Yeah, I want to get some good numbers with a better meter before selling anyways. So most likely not before next week anyways.

I also want to get some beamshots with all 3 lights side by side, the stock GT, xhp70.2 dome on and xhp70.2 dome off.

Just not sure of a good location for such a shot, most of the places I use are only big enough for one light, maybe 2.

That would be awesome!
BTW, have you tried an xhp50.2 ? It should be driven to the full power even with the stock driver at 5 amps.

I have not been able to find an MCPCB for it that would work in the GT, if someone knows of one I am willing to check but seeing as we are getting ~70%+ of the XHP35 numbers with the xhp70.2, I am going to say that most would prefer the 70.2. Honestly even it shines further then the naked eye can really see anyways.

I took some readings with the stock GT to compare with this meter and the results are even closer then I would have EVER guessed. I will need to recheck my numbers for sure once my new meter shows up.

It appears that the XHP70.2 is somehow reaching 80-85% of the throw that the stock XHP35 hi is doing! I am not sure how that is even possible but that is what the meter said in virtually back to back tests.

TA, are you testing them outdoors and at what meter height and distance?
High output lumens tends to have more reflections into light meter from surrounding that’s not open space.

That is a good point, these tests were indoors. That is a possible explanation. Although in past testing I have not really noticed a difference in readings at the same distance indoors or outdoors with my particular location.

Once the new meter shows up I will take some outdoor readings.

I will say that these numbers are higher then I expected.

Even if numbers of low output leds like an xhp30 are lower and numbers of more powerful leds like an xhp 70.2 are higher due to a low quality meter or indoor testing, it is clear that shaving or dedoming increases throw significantly even with the xhp 70.2!

Yes, the xhp70.2 seems to gain around 40% throw from a dedome, much more then I expected.

Wow! I’m very interested in a TA GT XHP70.2 driver when they’re available. :+1:

Forgive my ignorance, but I’m having difficulty understanding all of the modifications needed to get the 70.2 into the GT.

Do the battery carriers require modification? Does the 70.2 need a new MCPCB or can it be reflowed onto the GT’s stock 35 board?

Thanks, Texas_Ace!

It will need the Driver, MCPCB, XHP70.2 LED itself and Centering ring.

The stress test I ran was to see if the carrier springs could handle the power and they passed, although they were pretty warm at the end of the test.

I am working on getting the mcpcb’s made and getting them sold but it has been a hard sell for lumintop and they have still not given me an answer. If they don’t sinkpad makes an mcpcb that will work with some sanding/filing although it is not quite as nice.

TA, Where did you get the GT centering rings for the XHP70.2?

Thanks for the explanation.

I hope Lumintop gets on board after seeing some photos of your 70.2 protos… :slight_smile:

I 3D printed them :wink:

I actually printed a bunch of different sizes since the height plays a big role in the focus. Around 2.5mm saw the highest lux but it also has a dark spot in the middle at longer ranges. By going up to ~4-4.5mm it removes the dark spot with minor effects on the lux.

Yes, I am hoping they do as well, if these numbers hold up I am guessing they will, even I am shocked at these numbers if they are real.

I would not believe them if I had not seen them myself and I still doubt.

I am interested on the MCPCB with 70.2

I am interested in modding my GT with a 70.2. I will purchase the parts if they are made available…

Guys, how hard is to replace bottom part of GT, where battery tube goes in?
Mine is broken, Lumintop offered that they can repair that or I can do it by myself.
Mike

Well, it is very simple, you just unscrew the head and then screw it back on the new light engine.

The hard part is getting the head off. You will need a strap wrench almost assuredly. I was able to get one apart without a lot of hassle by loosening the bezel first and then the head. I carefully clamped the light engine in a vice to do this.

some are much harder to open though.

I would try opening it first and see what happens.