GT mini~reflash the latest firmware~

I said the XHP35 blows the other LED’s out of the water, that does not factor the driver into the equation.

The reason the XHP35 single cell lights underpreform up to now is that they all under-drive the XHP35 by a fair amount. The highest output boost driver I have seen was something like 1.25-1.5A output vs the 2.5-3A we want.

There are drivers in the works that will be able to do this but they are not ready yet.

Can anyone explain why Steel is only getting 3.4 amps from a high drain battery? I would expect more. At least 4.5A.

Is it due to the super long LED wires he’s using to test with?

Yes, those wires will cause a massive voltage drop and thus current drop.

Okay, that’s good to hear.

Were you able to do a tail cap amp draw test to see what it does in the light?

With a FET, it could exceed the 1200 lumen and throw specs.

Thanks for the great pictures steel_1024, well done!! (as usual :wink: ) :+1:

Thank you for reviewing… Sharp Pics btw… :sunglasses:

I can get some readings but I swapped the LED in mine to a NW LED so it would not necessarily match what would be seen in the production version since the Vf varies among the LED’s.

If people really want to see I can check though.

I did test the lumen output before I swapped the LED and with the new TA sphere it read a bit over 1200 lumens.

Hmmm, it’s good it does hit the spec’d lumens, not everyone can say that. :wink:

I guess I was hoping for a bit over spec since it’s FET. Maybe 6A and 1400 lumen. :smiley:

IDK, that might be pushing things. I guess spring bypasses can still be done.

PS, I just noticed they raised the lumen spec from 1200 to 1250.

Yeah, I read 1250 lumens on my sample so I guess they are using that number now.

Spring bypasses would net you a bump in performance but ~1300-1400 lumens is about the most an XP-L HI can do in my experience.

Any links to the GTmini sourcecode and hexfile.

Steel, I just noticed you reflashed it to NarsilM v1.2

The manual says it’s supposed to come with v1.3.

Did your early production model have a bug in it or something?

I know where NarsilM v1.2 is, but v1.3 is harder to find. I think Texas_Ace has it. Do you know him?

His prototype had the thermal regulation set to off by default. It could of been changed in the menu as well but re-flashing ensured it was like the production lights will be.

Here is the complete firmware file for the Mini-GT

TA, are they using a sense resistor to limit current?

It is an FET driver, so no sense resistor is needed.

Basically a 2 channel TA driver.

So why only 3A and 1200 lumens?

Is their choice of MOSFET that poor?

Thanks Texas_Ace for posting the sourcecode.

Like the GTmini for being a thrower with a simple, almost famillier driver,small and single 18650.

Having the sourcecode now makes me even like it more.

I have not taken an official reading but I expect it to be the normal for an XP-L HI, without spring bypasses, ~4-5A.

1250 lumens is pretty good for an XP-L HI without spring bypasses.

Steel shows a Uni-T clamp meter on it, out of light, making only 3A on a GA and less than 3.5A on a VTC6, pretty lousy. Should be doing closer to 6A on that C6 and around 1500 lumens or more.

If that’s all that driver can do I’ll have to wipe it and build an FET+1 with the more standard components. Should be able to see over 1700 lumens in the assembled bypassed light.

That’s if, of course, I stay with the XP-L emitter…