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

I ordered this today. (Lumintop GT70 Conversion Kit XHP70.2 LED NW+1*Centering Ring+1*TA Driver Giggle Monster)
I hope it has the right color. (NW)
Many thanks to the friendly users, in this flashlights forum. :+1:

Got a question about heat. Where is the threshold where the heat might damage the components? I know that when something is too hot to hold is above 50C. Does that temperature already represents a threat to the components? LEDs and drivers?
After seeing some videos about reflowing LEDs I can assume they can stand much higher temps than my hand is comfortable with.

No 50C presents no problem at all to components.

Hmm. At what temperature should I start worrying?

Hmmm… technically I’m not sure. Let someone else answer that one who knows for sure.
I let a Convoy S2+ with an 8 chip driver go one time for about 45 minutes on High. When I discovered/remembered it the thing was so hot I could not touch it barehanded without getting burned (which I did) before I grabbed a towel & shut it off.

It cooled off and continued to work fine. I do not know how hot it was…. BUT IT WAS HOT :wink:

I tested this light with a fully charged set of 8 30Q cells and disabled thermal protection. It peaked at 90C in a very hot garage.

This is fine for the components, they are generally rated for 125c or more and are not usually damaged until at least 150c.

Now the cells are the bigger issue, most cells max temp is around ~75c+, although the cells will obviously not be as hot as the head, when I pulled them out they were only around 50-60c IIRC.

Small correction - each cell carrier is 4S. Running three carriers would be 3P.

Like Newlumen said, you will need a coupler. The good news is that because of the GT’s cell carrier design, the battery tube doesn’t need to be conductive, so your coupler could be 3D printed if necessary.

Worrying about what? Don’t worry at all. You can set your light to step down at 40°C if you want. Or 35°C.

The driver components can withstand 230°C for a short time. This is when the solder becomes liquid.

Batteries can operate at 60°C to 70°C.

It’s the led that tends to get the hottest. I think it needs to stay below 150°C at it’s junction between the led and the mcpcb.

Woah that’s impressive. Im glad to know that my hand will melt before any harm comes to my babies… lol.

So let me get this straight. All these flashlights that have a thermal stepdown protection, they stepdown to protect my hands? Not the light itself?

I run blf gt70 turbo mode for 10 minutes… it’s get warm to medium hot… what a great heatsink… no sign of step down according from my eyes.

IDK, maybe yes? If you get burned you might sue the company. They don’t want that or the bad reputation of burning people.

It all depends on the light as well. Small 16340 lights that do 900 lumen can probably burn up the led due to the lack of surface area to dissipate heat. The led is always hotter than the outer surface. I’ve heard of lights getting so hot that the solder under the LED would get soft and then a sideways bump would knock the LED right off of the mcpcb.

So having a thermal stepdown is always good for high powered lights. It’s still not mandatory, though. My L6 is over 130 watts (17.6A) and it doesn’t even have a thermal stepdown (old Narsil verion). I turn it down when I feel it’s hot enough, so no big deal.

For most of them, yes, that is correct.

Holy crap 130w. Maybe I will get close in mine. Just ordered a driver from Lexel,although he’s still playing catch-up with his orders. IDK when he will be able to ship it to me.

Ordered the NW conversion kit.

Hmmm. Interesting. Changed my perspective on how I use my lights.

I may have missed it in the thread, but is there a way to order just the carriers? I see that they can be ordered with the conversion kit, but can they be ordered by themselves? Thanks for the help.

you can order just carriers. The listing for them is at the conversion kits. That made a little confusion.
You have 3 option there.
CW kit
NW kit
Carriers

Ordered NW conversion kit

Two questions from my side:

  1. If companies love making money, and us hobbyists love spending money, why don’t Lumintop just produce an extended 3 carrier battery tube, similar to how they have a shorty 1 carrier tube? That way there is no couplers and a single nice elegant 3 carrier battery tube? I for one would rather order a 3x carrier tube than ordering a coupler and a shorty tube
  2. How optimal is all the carrier springs, wires from driver to LED, and thermal paste under the LED. Will there be reasonable gains by bypassing all springs, replacing the wires from driver to LED with thicker wires, and replacing the thermal paste with something like Arctic Silver 5? Also, how thick is the LED shelf, and is there room to add some additional copper or aluminium between the LED shelf and driver?