The BLF GT70 "Giggle Monster" is here! 7,500lumens, 1,500m throw! Group buy Closed!

The white thermal paste is really not that bad in my testing. When it comes to OTF lumens, it made virtually no difference. Heck with enough clamping pressure no thermal paste at all was only a few lumens behind.

Sorry for the misunderstanding… I measured both olight st96 and mt18vn with the TA tube… TA tube show 10500 and 10720 lumen… then I use light meter app to get the all the lux reading. That’s the only way I can get good reading on the blf gt lights…

Oh OK… my bad, I understand now. :+1:

I think he’s referring to that white RTV silicone looking stuff that some manufacturers use and feels rubbery.

The GT (and I assume the GT70) use a proper thermal paste. It stays soft and never gets hard or rubbery.

This is from my BLF GT.

I would so totally be down for this. I’d be in for one more GT and 4 extensions. Or 6, maybe 10. :smiling_imp:

Well, do you have a license for a photon launcher ASAF?

It would also be classified as a siege weapon.

I would personally try to ram a door with it. Would be so fun

No license. We will need to keep this on the down low. I will only tell BLF/CPF and Youtube about it :slight_smile:

Yes sir… it is not the right way to measure lumen… i know two lights are measured by TA tube and use them as a reference… the lumen number are pretty good as you can see by my testing… those are @5 seconds lumen…

Ah, I see. The silicone thermal adheisive is still not horrible IF it is properly clamped down before letting it dry so it is as thin as possible. I have done this in a few hot rods and it works great.

Now in most lights it is used in, they do not clamp the mcpcb down so it is way to thick and yes, then it is positively horrible.

Going off how hard the GT is to open, I would not worry about insufficient clamping force :wink:

Lumintop BLF GT Flashlight DIY Short Body That’s the page at BG for the shorty tube but go to Martins site and join and get the code under Lumintop and that will take off $5,
$20 is a bit steep to me and I can’t just give out the code or Martin would scalp me or worse, but that price does give me a good clue as to what an full extension tube might cost.
Kind of funny at Lumintop, the secondary Giggle code for the conversion kit didn’t seem to work so I got hold of Victor and he fixed it for me, he brought the cost down to $83 for the kit and two extra carriers,
I have no idea what the discount would be but no matter I’ve gotten a good deal from Lumintop since day one, but then after I paid up it asks if you want to go to the home page and so I did and I noticed right on their home page another code for the GT that brings the price down to $220, ha ha… wow
I guess the GB might be sort of over with if their advertising a code of their own as well, I can’t help wondering why bother with these codes, just sell the light for $220 and skip the codes, nothing is secret anymore, there’s codes everywhere.
But, out of all the codes I’ve seen TA’s code is the very best so Giggle that…!

Banggood is doing their yearly anniversary sale with crazy low prices. This will be ending very quickly, though.

So you measured 2 lights with the tube.
Then you measured both with ceiling-bounce (cb) and set the factor in cb to a value, so that cb shows the same amount of lumens as the tube?

This way you could get reliable results with cb afterwards for all other lights…
(not taking into account, that different reflector characteristics will for sure also have a large effect on the results)

Lumintop has been very good to deal with… for sure…

:+1:

Yeah, that was what I was referring to. I’ve modded a few lights (not that many compared to others, but Skyray V2, 9xT6, Solarforces, BTU, etc) and each time it is easy to desolder and solder the PCB leads when the copper PCB is on those white thermal paste. Replace that with Arctic Silver 5, and you actually struggle to solder leads to the PCB, the heat is just pulled away too fast and I have a 80W 380’C regulated soldering iron. With the fat tip you have to hold it quite some time to warm up the PCB, PCB shelf and wires.

That led me to thinking that while better thermal paste won’t give you more lumens OTF on a cold start, it might give you a higher sustained lumens OTF because the LED wouldn’t start thermal throttling, and it might even prolong LED life? If I can open my GT70, I’ll do a comparative test when I get it :slight_smile:

If I´ve to solder wires to a copper MCPCB, I try something like this:

Put the thermalpaste on the ground, put two pieces of metal (heat-resistant) on the ground and than the MCPCB on it.
So the heat isn´t pulled away too fast any longer.

After soldering you can remove the small pieces of metal and press the MCPCB down and rotate it a little bit to evenly sread the thermal paste.

Yes yes., I use a light meter app…

I’ve found my 80W Yihua 995D soldering station can’t unsolder certain mcpcb leads (30mm copper). The 995D would melt the top part of the solder blob then the whole head of the flashlight would get hotter and hotter.

Then I tried my cheap Velleman 50W and it can melt it very easily and quickly without heating up the whole head.

It’s theorized, and it seems plausible, that it’s the somewhat loose fit of the tip onto the heating element that is not allowing good heat transfer. It’s said that the genuine Hakko tips have a tighter fit to the heating element and is one if the reasons they perform so well. I’ll try to test this theory soon.

And now you know why I’m T-18 that is my go to solder tips always, Hakko solder tips are the only ones I ever use, the best IMO…

I had that same problem when using the china tips, ever since switching to the hakko tips I can solder mcpcb’s mounted to a light with good thermal paste without an issue as long as the substrate has enough thermal resistance. The clemance mcpcb’s are hard to solder no matter what for example.