Host with a decent incan driver?
I think I helped mostly beat the idea to death
here, but since I missed this thread, and since you are asking, perhaps the request could be satisfied: incan modes with increased runtime of lower modes, and done without utilizing migraine-inducing PWM, i.e. w/ CC or PWM so fast the filament doesn't have time to wiggle even as much as residential AC lighting. Add softstart and regulation, and you're a miracle worker. Squeeze it all in a non-weaponized E-series compatible tailcap, or just give us the internal hardware to fit in z52/z54 or z57/z61, or a proper incan driver in a bipin socket just like like Tad Customs E-socket, and you become legend. I would at this point even be perfectly happy with a control ring for smooth brightness adjustment, or QTC. Naysayers balk at underdriving lamps at non-ideal efficiencies, but I don't care how warm the color gets when full brightness will blind my dark-adapted eyes.
So I think it would be pretty neat to have a boring and subdued-style fitting 18mm single-cell E-series compatible host with modular momentary/twisty tail that can pump incan close to 500lm, direct and at full brightness, but with lower modes for more runtime, at a yellowy 15lm, or 2%, and another in the lower middle at less yellowy 120lm, or close to 25%, lower modes regulated for constant brightness, with users' programmable choice of whether to start LMH, or HML, or whether to have mode memory turned on or off, and also with a low voltage cut-off to save our precious cells from overdischarge.
Cool thread. Thanks for asking. I like to dream.