Neven, when your store will be open again, will there be new drivers available that were mentioned some time ago?
I can't precisely tell when since I'm still in process of opening LLC. What can I tell is that I can't "transfer" stuff (LEDs,PCBs etc.) I currently have to LLC, so that sucks, I will at the beginning only have new stuff (MCPCBs, Osram LEDs, LD-x4 drivers). I'm working on drivers (lack of time as usual).
Disabled it and it worked fine, so I wondered if the board needed better contact with the spacer.
Sanded the legs of the optic a tiny bit, to make sure they were not ‘bottoming out’ before pressing down on the mpcb. Cleaned and re-applied heat transfer compound.
With temp regulation on, light now works for 1min+ before it gets too hot and steps down, all good :+1:
LD-A4/B4 use external NTC sensor for temp. measurement, so driver contact with spacer is not important. Is seems that LED PCB did reach ~60C, which is not too surprising, but if flashlight itself was relatively cold that would mean bad thermal contact somewhere (LED PCB - spacer, or spacer - host, or both). So I would check if there is enough thermal paste, maybe you have aluminum burr/dust from drilling between spacer and host which prevents proper thermal contact etc.
I wonder if there is a way to leave the item descriptions online without the store. I had trouble getting a triple Luxeon MZ working on a MOSX PCB until I found in the Google cache I needed to bridge the MOSFET footprint.
Only way is to manually change stock qty of all items to 0.
As I learn about drivers sometimes there’s a thing that surprises me.
This happened with LD4 recently.
5mΩ resistance is quite low considering that you probably need to sense current somehow.
I wonder if you do this with a really low value resistor or use some other sensing technique or sidestep this in an entirely different way.
I know that the exact construction of LD4 is a trade secret and I don’t ask you to reveal any special sauce but if this actual thing is not something special it would be great to read it.
5mOhm driver resistance is accomplished by using 1mOhm sense resistor (nothing special about it), FET adds about 3-3.5mOhm, traces 0.5-1mOhm. LD-2/3/4 design comes from era when XM-L2 and XP-G2 were most popular LEDs, and they both have very high Vf, so driver with lower resistance allowed higher output on max. mode. But there is always trade-off, in this case lower resolution on low currents.
These days basically all good emitters have quite low Vf and there is no need for such low parasitic/internal resistance (that's why my next drivers will have 10mOhm sense resistor for 5Amp driver).
I see, thanks for the explanation. 
Neven, some time ago I installed one of yours 9A driver on a 14500 flashlight, powering 3x XP-G2 Leds.
It worked fine until some weeks ago, and I just wanted to perceive what may have happened.
What happens now is that it only works with 2 modes, like Moonlight and Turbo, no matter how many times I click, I can’t enter the programming mode.
Could it be some component that “burned” or got damaged, and that originated this inability to have more modes or enter the programming?
BTW, the host is a Jaxman E3 and I am using a forward clicky switch.
Thanks in advance!
PM sent.
Thanks Neven, PM replied! :+1:
Triple in Jax E3? How did you do that?
Yup!
I would say with lots of time and effort, but I did it this way :
What did you mod today? - #7136 by MascaratumB 
What happened to the website? I cannot access led4power.com anymore since some time (weeks, I’d say). The problem might be on my side, but don’t know how to fix it.
Mentioned even on this page! Overlooked it 
Thanks!
How long do you plan to keep it closed?
Constantly closing stores to avoid paying taxes is a very bad attitude towards customers 