BLF GT (preliminary) modding thread

As requested in the GT thread.
Kick off for the mods on the Giga Thrower.

Mod battery carriers to 8P1S (or 4P1S if there is the small tube) , and replace led it with dedomed sst-40 and a fet driver (still running Narsil) .

I will probably test it on a friend’s GT :wink:

U evil :smiley:

He asked for it ! :smiley:

Made a C8 with dd sst40 and he loved it …

Don’t have a real use for the GT, so I will go for a old style xp-g2 for máximun throw ( maybe an oslon black flat later).
Now there are two ways for the driver depending on voltage.
4s: LD-3 driver. If I remember correctly it can drive a 3v led with four cells in series.
1s4p: using just one cell holder and a DD driver. This means making some new boards for the holder.

Any other options for a 3v led?

This isn’t correct , led4power’s Ld-3 driver is direct drive style driver .

Other solution is buck driver from Richard (mountain electronics).

Nope, the LD-3 is a linear driver. It keeps the current constant as long as the batterys voltage is above the Vf of the LED. Excess voltage is burned off as heat in the driver. :wink:
It’s more efficient at some points compared to normal FET drivers and can keep your LED from dieing from too high currents.
It does have a DD option though if one really wants that.
An XP-G2 would require a 1S setup.

So the LD-3 can put down the votage from 4s to 1s led or not?

For a 1s set up cell holder I would need the help from someone to desing te board for oshpark.

No it can’t. It would burn up.

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 :sunglasses:

As Giorgoskok pointed out, a MTN buck driver is a good solution for a 3v led and no need to modify the cell holders. This one: 17mm MTN-MAXlp HP 1A-5.5A Low-Profile Buck Driver - 5V-18V
But remember that this driver must have a thermal path to the flashlight body.

With an xp-g* why not just use one cell per holder and use a bit of wire as a jumper, that way you can easily revert back to standard, same with two cells for 6v leds, and use three cells for those hard driven 6v leds :smiling_imp:

Cheers David

Nice idea David. That would be more on the budget side. :+1:

For an XP-G2 it would be highly preferable to use 2S battery set up with a buck driver, because the Vf of an XP-G2 is around 4 Volts or more when you drive it hard.

^ What he said :smiley:

Cheers David

Ah dummy pass through carrier fillers, smart!

Does anybody knows what kind of max amps we can expect from the original driver (modded or not) on a xhp70(.2) ?

I’m pretty sure the xhp35 on mine wont stay long, i’ll transform the GT into my dream K60 on steroids.

Standard the driver puts out 2A on high and 2.5 on turbo, that should stay the same for all 12v leds.

I did read somewhere in the group-buy thread that it can be modded to 5A with cooling.

If I am wrong will someone please correct me

Cheers David

IIRC, 5A is indeed its limit. It definitely needs a good thermal connection to the flashlight body. Might even need more heat sinking at that power level.

What about a hardcore mod? (spacer needed).

- seven reflectors: http://kaidomain.com/p/S026180.42mm-x-57mm-SMO-Aluminum-Reflector

- 3P xhp-70.2 (12v configuration each) wired in paralel with 4s dedomed xp-g2.

  • FET driver.

Only question, is there a 4s battery capable FET driver with electronic swhitch configuration for this mod?