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

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Yokiamy
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Nev wrote:
It would have been much quicker & a lot less work to send it back for a refund & buy a new one Tired

Do not underestimate registered shipping costs to China of this light.

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Texas_Ace
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JasonWW wrote:
Texas_Ace wrote:

Overheating the LED could cause something like this, but then so could over current.

Wow, I didn’t know this. I’m gonna have to add it to my mental troubleshooting list.

So too much heat or current (only on 70.2 or other leds?) can cause it to function normally, but only up to a certain brightness level, then it just stops there?

What do you think causes this?

It can happen with any LED I think, I have seen it with several brands and models thus far.

Not sure on the exact cause but I am guessing the LED just fries itself internally and after that the internal “resistance” is such that only a small amount of light can be made. I have noticed the Vf increases drastically on LED’s that have this issue.

Texas_Ace
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Isn’t cutter in AU? I think you could get a replacement LED form them that is better then what lumintop uses much easier. They have good prices as well if you live in AU and don’t have to pay the shipping.

Nev
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Yokiamy wrote:
Nev wrote:
It would have been much quicker & a lot less work to send it back for a refund & buy a new one Tired

Do not underestimate registered shipping costs to China of this light.


But if you’ve paid through PayPal you can send it back on them.
Yokiamy
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Nev wrote:
Yokiamy wrote:
Nev wrote:
It would have been much quicker & a lot less work to send it back for a refund & buy a new one Tired

Do not underestimate registered shipping costs to China of this light.


But if you’ve paid through PayPal you can send it back on them.

I wouldn’t bet my chances on that

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ThembaFatsani
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But then we wouldn’t have had this wonderful adventure together now would we? Big Smile

I tried looking for an au seller for an led but came up with nothing particularly good. I just ordered a couple more from mntnelectronics. And I asked lumintop if I could have another on an mcpcb just incase I bugger it up with the reflow….. covering all bases. Already spent silly $ why stop now… Facepalm

patmurris
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Coming late to the GT70 party…

I own the original GT and just discovered the 70.2 conversion kit on Neal’s site.
Just to be sure, do i need new cell carriers?

Dutcheee
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Never too late! I just discovered the FT03 amd ordered..

I converted my GT to 70.2, cell carrier still stock and works great. Awesome mod Thumbs Up

patmurris
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Dutcheee wrote:
Never too late! I just discovered the FT03 amd ordered..

I converted my GT to 70.2, cell carrier still stock and works great. Awesome mod Thumbs Up

Great! Thanks!
Did you have trouble opening the head? I haven’t tried yet…

Are 8 cells recommended or does it work the same on 4? – i’ve got a choice of 35E (actually in my GT) or 30Qs… I’m assuming 4 is enough to power a single 70.2?

Nev
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Yokiamy wrote:
Nev wrote:
Yokiamy wrote:
Nev wrote:
It would have been much quicker & a lot less work to send it back for a refund & buy a new one Tired

Do not underestimate registered shipping costs to China of this light.


But if you’ve paid through PayPal you can send it back on them.

I wouldn’t bet my chances on that


I’ve done it a few times , maybe it’s because I live in the uk ?
Dutcheee
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The head was kinda tight, not too bad. I used a rubber strap oil filter remover tool to unscrew the head.

On 4 cell’s 30Qs are recommended due to high amp draw (for high power-on lumens) Should work fine, but lower runtimes obviously.
On 8 cells 35Es will be fine.

patmurris
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I quickly tried to unscrew my GT bezel to no avail… I’ll have to try harder. Is it the right part to disassemble?

Are there any how-to video or thread somewhere that explains the GT70 conversion kit mod?

Texas_Ace
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Yes, try to unscrew the bezel, sometimes the head will give before the bezel but that works fine as well,

VOB made a video showing how to do the conversion. It is simpler with the kit then his video but it still shows the steps.

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patmurris wrote:
I quickly tried to unscrew my GT bezel to no avail… I’ll have to try harder. Is it the right part to disassemble?

Are there any how-to video or thread somewhere that explains the GT70 conversion kit mod?


Here are some pictures I took.

I removed the switch cover so I could clamp it in a vise. Pieces of wood with a depression for the switch will also work. I found that loosening the upper head from the lower head removes tension on the bezel rubber seal which makes the bezel a bit easier to unscrew.

I had to use a lot of force and slowly unscrew the pieces. They are tight.

patmurris
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@Jason: Thanks for the picts – i think i saw them somewhere some while ago… Damn, it does not look easy. I would have to get the rubber tools and a bigger vise… Not sure i’ll get into this mod.

How about heating the bezel wish a hair drier? It should dilate a little more then the head and become easier to unscrew? That may damage the lens though?

JasonWW
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patmurris wrote:
@Jason: Thanks for the picts – i think i saw them somewhere some while ago… Damn, it does not look easy. I would have to get the rubber tools and a bigger vise… Not sure i’ll get into this mod.

How about heating the bezel wish a hair drier? It should dilate a little more then the head and become easier to unscrew? That may damage the lens though?


A lot of the resistance is due to the rubber oring.

The lens is glass so heat will not effect it.

I don’t know if heating the bezel will help or not.

Dutcheee
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I clamped the flattened part with the button on it in a work-mate. Unscrewed the whole top including reflector with a simple rubber strap shown in JasonWW’s pictures. I didn’t really need the tool I think. Mine came loose easily, so I guess there is a lot of variation.

ThembaFatsani
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What a relief it is to have my GT70 back up and running.

I got my replacement LED’s in the mail yesterday and I’ve been hyping myself up for my first reflow attempt on an LED. I had a few practice runs- I used a hot air gun on the bottom of the MCPCB- holding it in place with some alligator clip helping hands. Holding the heat gun about 6-8 inches away seemed to heat it nice and steadily. The solder paste really worked like magic on it too. I was able to remove and replacing the dead LED on the other MCPCB with minimal fuss, using a big pair of metal tweezers. Once my hands had steadied out and I had some confidence I fired up the hot air gun again and had a go at the GT70 MCPCB.

It went surprisingly easily, the LED floats straight on to the pads and with a little pat down on top the excess solder pops out the sides. Beautiful.

I screwed the whole lot back together (with a liberal application of thermal paste under the MCPCB) and fired it up, and finally its back to it’s old self blasting away the darkness.

Thanks again to everyone here with the advice and tips, guiding me on how to get this job done properly. You guys really are top notch. Here’s to hoping all my future work on this light is making it more epic with mods not just fixing it.

Cheers!

JasonWW
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Nice! Thumbs Up

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