I don’t want to speak out of turn, but… yeah, what’s up with that? A $200 custom flashlight running on what appears to be a stock oldschool Nanjg 105c? I’m not a huge fan of DD, but it does seem that there are more flexible (and straight up better) options available than the 105c - both in terms of power and firmware. Even if all a person wanted was high/low, offtime would add a lot. A 20mm driver cavity would allow for many options.
20mm BLF20DD
20mm 12*7135 driver
LD-29 (with 2s)
I suspect that there have been some developments in recent years that elektrolumens is not aware of.
Not to mention the impressive proprietary things available through folks like DrJones and ttrev3. I suppose it’s worth pointing out that the forthcoming LD-1 from led4power is actually a 17mm driver rather than a 20mm driver, but I certainly wouldn’t be surprised to see a 20mm variant become available.