Ok then, do you know what chips ARE on the driver? It looks like 7135s to me, from the photos in this thread I can’t make out the numbers on the chips. The wording in that post lead me to believe that it uses 7135s. Then there’s the post #1174 in the BLF-348 thread where I was told 7135s employ thermal regulation…
The main thing is… the light appears to be thermally regulated on a li-ion battery. Do you agree? I was making an educated guess as to what was causing the brightness fluctuation. It LOOKS like thermal regulation. I have run this light several times with a 10440 for 10-30 minutes and it operated just fine.