Out of all the aluminum parts, the one which would most make sense in copper is the pill section, the knurled section at the head. That’s where the most heat is.
I’m not sure why anyone would want a copper inner tube, since it isn’t visible and carries no significant amount of heat or electricity. Copper there would mostly just make the light heavier and more prone to unintended shorts.
Electrically, a single thin wire would work fine in its place. It should be electrically shielded somehow though, to prevent shorting between ground and the switch signal. On mine, the anodizing there was too thin and it seems to have made the driver clock speed unstable, but when I put a piece of paper between the tubes, the clock speed went back to normal. So, if anything, the inner tube might get a thicker anodized layer than the rest of the host, to prevent that type of issue.
Maybe the final design should be modified to be done more like how Liteflux did it.
My Liteflux LF2XT also has an electronic tailcap switch and inner tube, combined with outer body. In order to electrically insulate the inner tube and keep it isolated from the outer tube, Liteflux inserted a thin plastic middle tube.
Dotted Lines in the Ramp:
Bottom and top line are the Moon/Low Level and the top off the ramp=ceiling. You can reach the top for ceiling by double click. (a second double click brings you to turbo)
Middle line is the maximum from the 7135.
Two fast clicks brings you to the ceiling (green solid)
The click, release, hold (green dashed) ramps downward from TURBO Edit: ceiling
But I should probably shut up, because I haven’t Andúril running on a lamp.
One suggestion for the thermal rampdown: Can we add a cap to how far it ramps down?
One problem I’ve notice with my Emisar D4 is that it starts 4300 lumens, but within a minute it ramps down to about 50 lumens, which is way too far. Then it takes forever to ramp itself back up again.
It would be nice if it stopped ramping down at 500 lumens instead of keeping going. Maybe have the rampdown stop when the light reaches 25-30% of max power no matter what the temperature sensor says.