interesting points, here are some alternative interpretations
Lumintop has no problem machining the Copper Tool, Copper Worm, Copper Prometheus Beat, and Copper Maratac
imo storing heat is not a benefit when trying to move heat away from the LED. Stainless and Titanium have similar heat insulating properties.
imo Surefire chose brass because it is not going to get as warm as aluminum, when using the 300lumen mode.
Basically, they used a material with lower heat conductivity, and higher mass, which I think is intended to keep the light feeling cool in the users hand. But it accomplishes by storing heat, as you said, instead of dissipating it.
I suspect similar heat insulation motivation by Olight, in the 180 Lumen Brass i3s. That is a raw brass light, and as such exposes the user to Lead.
The Titan Plus has a Nickel plating that isolates the brass away from contact with the user.
Interesting points there. On the Olight i3s EOS I just bought several and I noticed that on high it heats up pretty fast, faster than I was expecting. I also EDC a Maratac stainless AAA and at the high of 120 lumens it doesn't heat up nearly as fast as the brass i3s. Of course the Olight has 1/3 more lumens on high but the i3s still heats up faster than I was expecting, so there might be something to your idea of the brass storing heat. Just my subjective impression but I use a lot of different copper, brass, and stainless lights.
BTW, speaking of heat, the heat equation is very interesting. To quote the Wikipedia article:
"The heat equation is of fundamental importance in diverse scientific fields. In mathematics, it is the prototypical parabolic partial differential equation. In probability theory, the heat equation is connected with the study of Brownian motion via the Fokker–Planck equation. In financial mathematics it is used to solve the Black–Scholes partial differential equation. The diffusion equation, a more general version of the heat equation, arises in connection with the study of chemical diffusion and other related processes."
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