First Mod. Need Help with my F13

[Funner]

@EasyB

The 12V XHP50 really should work correctly with the driver like the XHP35 does. You ordered the 12V XHP50 from mtnelectronics?

Yes

[Lexel]

@Barkuti

Funner, what kind of 4S/“12V” XHP50 board are you using? Boards which make use of the emitter’s thermal pad to connect the emitter’s two 2S stages will not work correctly and I guess the problem you describe is exactly the symptom of such problem: the driver cannot regulate and goes “direct boost” over the upper 2S dices because the thermal pad is directly connected to battery cathode/negative terminal, sensing nothing over the current sense resistor (which is located between emitter’s negative lead and ground). At least this is the way the H1-A driver works, a driver likely designed by the same fellows.

These are the bad boards:

Source: https://www.aliexpress.com/item/20mm-Cree-XPE-XML-XHP50-XHP70-MKR-led-Cooper-PCB-Board-Led-Heatsink-Thermal-Separation-Led/32727123202.html

Possible solutions:

• Use a standard XM/2S2P/“6V” board and adjust the driver’s output divider for 6V operation (check Jensen567’s thread).

• Isolate the board from the flashlight’s body with some kickass high conductivity film. Clemence has something interesting if I do remember right.

Cheers :partying_face:

That board with XHP50.2 will likely light up only 2 dies and still runs 6V without insulation