Direct drive with blf a6 driver vs direct drive without driver?

I’m getting very different results right now


I had my Randar RA-601REF as my host
Samsung 26F protected cell
XM-L2 U2 dedomed on stock aluminum pill (will swap to copper when I have time)
Changed the wires to some thick gauge powercord wires

But

BLF A6 driver on high I get 3.2A max
Direct bypass 5.8A (tripped the protection a few times and LED starts to shift tint every 2 sec)

This makes me question if the FET is really direct drive or it is only up to certain amount of amps? I’ve seen some rated at like 4 amp max or something but I’m not sure.
It definitely made my light toasty hot within seconds though

did you do spring bypasss
and the FET has some resitor value, too

Basically bypassed everything. I’m guessing fet is enough a resistor to protect LEDs. Kinda burned 3 xml2 chips due to overdriving it even when it is bolted on noctigons to solid pills.

With the fet driver installed, you did bypass the springs? Most of the resistance will be in the springs. The driver itself also has a little bit resistance but mostly not enough te really notice it.
Are you sure that you where in the high/turbo mode?

You can measure the voltage drop of the driver
Measure from LED negative to head

If the FET is pwm you can see that in shower

is this driver from banggood? I don’t think the max output is true direct drive with their version. Do your modes change properly?

FET drivers are a compromise between true direct drive and having modes so there is some added resistance from the FET though it should be single digit milliohms.

Pretty sure my spring bypass is able to handle at least 16 amps judging from the power cable used
Pretty sure I’m in turbo as I’ve been using blf a6 driver for 4 months

Voltage was about 4v before it starts to blue and 3.2v when it gets really blue
Battery was constantly above 3.8v most of the tests
Pretty sure I’m in FET constant driver as there is no pwm

Banggood driver. My modes change properly unless when it gets heated up to handwarmer temperature

Well I’ve reached 3.8 amps once with a triple nichia 219c with this same driver but not on single XML2

3.8A to a triple is way low.