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Thank you all for your replies. I’m quite particular about what I want to achieve. “100%” mode in such a small light makes no sense to me, because it will just thermal throttle in about a minute, so I would rather not even have this mode. For me an ideal strobe would be something along the lines of 50 ms on, 50 ms off, 50 ms on, 850 ms off. Like an commercial airliner forwards facing wing light, two very short but bright signals, followed by a second of darkness.

Low voltage monitoring and such are less important to me, and I think having 2 hours runtime would be sufficient, but with the strobe I’ve described, I see no reason why wouldn’t it work for many more than that, because it would only be emitting 10% of the time.

About the light: It’s not bright by any means in any of the constant modes. But the weight of it makes it really versatile. I put it on my helmet, baseball cap to run with, handlebar of the bike. It just needs an O-ring to attach to many of this stuff, and perhaps a small rubber pad, so it doesn’t move around, but on the helmet even this is not necessary. 35 grams weight makes a difference. It has very little knurling, so it’s comfortable to bite down on, and use it that way around the house. I removed the keychain loop and smoothed the cap with 2000 grit paper, so mine can stand on it’s tail. Even this tiny 200 real lumens light (total guess) can be seen from about 300 meters on the road, because in strobe mode it doesn’t dim down and it’s not getting warm. I would characterize this as plenty bright for city use, and the tenacity of the strobe is annoying even. 200 ms on, 200 ms off. It’s just relentless.

I anticipated custom firmware stuff to be easier. I’ve been reading some source codes from the Flashlight Firmware Repository, but