I think the diffrence between 219C Vf and cell voltage is too high. And the issue will be more pronounced at lower modes because of less cell voltage sag.
I experienced that issue with a Luxeon V. And with the 3V XHP50.2 it was even more pronounced. Then I tried XP-L HI, No issues at all…
The silicone cubes cured the problem for the Luxeon V but the XHP50.2 Vf is so low that it still caused the driver to overheat after about 5min on lower modes with a fresh cell.
Thanks Kevin for answering to these questions to dropman.
3-4Amps is usually where power dissipation in driver is max.
Adding some thermally conductive material like those silicone cubes helps a lot, but just putting piece of cube in pill wouldn't help much if cube is not in good contact with both pill bottom and fet top surface.
This means amount of silicone pieces should be such that you feel slight pressure during driver retaining ring installation.
Other solutions is to use lower power/higher capacity batteries (30Q doesn't make sense for 4Amps), not using spring bypasses etc.
Does anyone have a link to the UI for the LD-A4 driver? I just discovered I have 2 of these drivers tucked away and never used them. I’m trying to figure out how to set the amperage on the driver. Thanks!
If I want to change modes it flashes once and it remains the same brightness level but after one second it drops power, or increases if you go from low to high.
I looks like I only have 2 modes now.
I’m not sure what the exact driver is, I also have a lighted tailcap installed.
Seems like you are in programming mode… do 10 to 12 consecutive half taps, the light will then turn off. Should be fine then. I highly recommend reading the manual thoroughly.
Would’ve never thought it was in programming mode. Haven’t touched that light in maybe a year.
Even after reading, although it was a quick read, the datasheet I wouldn’t have thought about it.
You can enable Configuration menu password, this will prevent unwanted entering into config. menu after 10+ half-clikcs (with configuration menu password enabled, only possible way to enter into config. menu is to enter 1865 password via clicks).