I bought a neutral XP-L HI mounted on a copper 16mm board from KaiDomain. I swapped it into a BLF A6 and noticed that on Turbo it would start out neutral but a second later would get a bluish tint. I had used thermal paste, but was afraid there wasn’t good contact. My tube of Fujik had dried up, so I got some arctic alumina adhesive and epoxied the board in place. Same result. It goes blue fairly quickly, but the light seems to get hot like it should. Now I’m suspecting the board itself. It is a copper board, but when I take the bezel off to reveal the LED and board, I notice a trail of smoke rising from the LED on Turbo, and a little on High (set to 4 modes). The LED isn’t brown or anything, but there is smoke every time. Is the LED not mounted correctly? If I let it get hot, will it reflow on its own or should I get some solder paste and try reflowing (I’ve never done it before)? Could there be something on there that just need to burn off (seems unlikely)? I tried knocking the LED off the board to see if it was barely hanging on, but it seems pretty secure.
If it’s the emitter itself, there’s nothing to be done.
Is this KD copper board direct thermal path? Just because it’s copper doesn’t mean it has a DTP. If not, that’s your culprit. Getting way too hot.
My thoughts are as Of mentioned. It may not be a DTP MCPCB. The direct drive was just to much of a good thing.