I am sharing this issue with you to make you benifit from my observations. In this case i only thank Georges from taskled for helping me to solve the issue. I also write this because I am not the only one with this trouble occuring. Remember that when we desing light, we dont test them in all conditions occuring during regular dive.
Codiak had reported a similar issue in this post:
Some week ago, 3 divers reported an issue with 3 different canister light with the same trouble. When the light is fridge cold, or even less (tested to -25c in my shed) the light turn On as it should but it wont turn OFF, 20 times in a row. I must unplug the battery to get it OFF. During the dive, water was around 33-32F, and 28F on an other.
Here is the setup used
Battery pack is 2s2p or 2s4p for a voltage of 7.4v. Fresh battery from charger, or medium charge dont change the issue. Cold or normal battery dont change the issue.
Cable is AWG14 40'' long. In the head light, i have a hall toggle switch that is triggered by a magnet. Even if i use a UBER magnet pulling 74lbs the light still won't turn Off. The led module used is the 5x Xre-R2 from DX
George also tought that magnetic field leaking from the board could mess with his board. I runned the board out of mag head with Awg16 3inches long silicone wire, same trouble.
I had a good talking with Georges from taskled wich make the hall toggle board. He suggested that i try his board, cold, with an incan light, and it work flawlessly 20 times in a row. He also state that his components are all rated -40c and i trust that.
My experiments went better, but not perfect when using capacitor on input of HallToggle. We think that something in the DX boost board is going worng with cold, maybe latching too hard, fast, or slow thus reseting the hall board quickly, this one could not complete the OFF operation.
I did not get in hand capacitor rated for cold use yet.
Did some of you had similar trouble with the same parts or other parts ?