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February 21, 2018, 3:15pm
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skinny_tie:
I turned on my recently modded L2 this morning in FET node and the emitter was bright for a fraction of a second before becoming very dim. It now only illuminates very dimly, although I think there’s a very slight change in brightness when I switch from moonlight to the next mode.
Could I have cooked the emitter? A similar thing happened in my Comvoy M2, butt in that case it was after it had been on for a while and the die is only partially illuminated.
The emitter is the original XM-L2 which has never been removed, and I think it’s on an aluminium MCPCB. The driver is a TA from Lexel and I used 18AWG for the leads and spring bypass. Cell was a freshly charged 30Q.
Most likely. See this thread on XML2 test, Texas_Ace found his to die at 5.5Amps (with older production XML2’s going up a bit higher to 9Amps or so) which you would have easily exceeded with your mod and driver. On the plus side this is a good opportunity to upgrade to a newer LED and MCPCB to take full advantage of all that current.
Another test, provided by donation from CRX.
I figured a classic XM-L2 would be a good one to test for the heck of it. I was surprised when it blew at only 5.5A. It looked like it would going to keep going pretty good.
The bond wires are obviously the weak link on these last gen emitter. The newer ones are not limited by this and is a large part of why they can handle so much more power.
Although I think we are reaching the limits of the 3535 footprint’s ability to shed heat, I would like to …