I built Convoy M21C with Xhp35.2 6500K 80cri from Kaidomain. I used Convoys 12V 2,5A boost driver with it.
Hotspot had weird yellowish center with tiny blue dot in it. Around that yellow area beam was about 6500K as it should.
After some use emitter had donut hole symptoms and I checked the reason. Whole emitting surface was charred black. I cleaned it and underneath the black stuff the led was perfect. After that I tried it again. No more yellow area and no more charring.
Seems to handle 2,5A well. I don’t know the reason for charring. I cleaned the led with q-tip and electric cleaner just before closing the bezel. After the charring I cleaned it with same method and it seems to work just fine.
So that GT FC40 would be a 12 Volt emitter. Didn’t know as not much stated on Simon’s listing. There was some talk about on the forum, but it wouldn’t be getting anywhere so I dropped the thread. Basically new LED and not much known about it.
Would be nice to have the link, always less hassle in trying to get some info without all the fuzziness. Still curious about the current output. Richard doesn’t commit to any ballpark values (I suppose that’s because it could have multiple input configurations).
Pardon my interest as isn’t altruistic but for myself – was looking to build such light with an SFT70.
I changed emitter to my Sofirn SP35, because it was bit too throwy to my taste. I put in XHP50.2 from Sofirnlight.com, that they tell is 5000-5300K. It might be 3A chromaticity bin. Doesn’t seem that green as 3B from Cutter and maybe bit warmer. Otherwise nothing spectacular. Little brighter and floodier than stock light. Bezel was tightly glued. Now I suppoce this is quite efficient flashlight thanks to buck driver and XHP50.2.
Originally I was looking to use Convoy’s XHP70.2 boost driver with the SBT70 (using an L21A as host). Can this driver (link ) be upped the current, say to ~7Amps by piggybacking a 20 milliOhm to the 10 milli sense resistor?
Intended Molicel P42A battery, should be able to handle the 15 Amps.