Thank you for all your efforts. They are greatly appreciated as I have learned from your posts and studied the manuals (even for lights I do not own) which you have provided at:
https://drive.google.com/drive/folders/1e1IWuBMaDQu-YjuigGpMwdUPErdUrMhe
Below are my personal opinions, but please take them as advisement only and make your own final decision, as I am not aware of everything you took into consideration before making your decisions.
"1x click" could be more clearly be stated as "1 click"
"2x click" could be more clearly be stated as "2 clicks"
"3x click" could be more clearly be stated as "3 clicks"
"4x click" could be more clearly be stated as "4 clicks"
"Cycle to standard strobe mode" could be more simply be stated as "Cycle to Strobe mode"
"Cycle to SOS strobe mode" could be more simply be stated as"Cycle to SOS mode"
"Cycle to Beacon strobe mode" could be more simply be stated as"Cycle to Beacon mode"
In the section "When the headlamp is OFF", after using "2x click" to Strobe, SOS, or Beacon mode I am assuming it is "1x click" to "Turn OFF" but this was not clearly stated for those modes. Maybe to be more clear the"1x click" "Turn OFF" line in the chart should be the bottom line of that section and state "1 click" "Turn OFF from any of these modes" and use a similar type wording ("1 click" "Return to previous standard mode from any of these modes") in the "When the headlamp is ON" section. Or have both the original "1x click" line and also a bottom "1x click" line in the chart so it is very clear (but that would be more words which is not always best). But it is OK as is, it just was not as obvious to me as your instructions for the rest of the chart were.
It was not clear if both LEDs are on at full power in Strobe, SOS, and Beacon mode like they are in the Turbo mode.
It would not be a true "Electronic Lockout" if moonlight remains on after a "Long press" while in "4x click" lockout mode. I would not want my headlamp to discharge unexpectedly while in my backpack. I would have it locked out mechanically by un-twisting the tail cap or head but others may not. The mechanical un-twist lockout method should also be mentioned in the manual as some may not know about that.
Your choice for the sequential order of "Strobe, SOS, and Beacon" is the best compromise. Strobe is the mode most people expect first. SOS would be the most important emergency mode. Beacon is the mode probably used the most but the order you have chosen is easy to remember and what most people would probably expect.
"Click" or "Long Press" to change brightness levels is the most difficult decision as there are pros and cons for each method. With a flashlight I can live with either but with a headlamp I would probably prefer "Click" to change brightness levels because (in the most difficult situations where I may be using a headlamp) I have an easier time getting to the correct level I want when doing it this way while wearing a headlamp which is moving around on my head while I "Click" or "Long Press". But if you use "Click" for brightness level changes then you must also use "Long Press" for OFF. It is probably best to choose the most common method as you have done because that is what most people expect and would want.
I do not know the specific mechanism as to how the proposed "3x click" "Check battery function" will operate (maybe different colors and/or blink patterns on the switch's internal LEDs to indicate the voltage) but In addition to that I would also like to have a low voltage battery warning that occurs automatically while the headlamp is on and is also very noticeable while I am wearing the headlamp on my head (as I will not be able to see the switch). Maybe something like a blink sequence that occurs occasionally as low voltage is approached and then more frequently and finally almost continuously right before the headlamp light cuts out due to low voltage (and I hope this headlamp will have true built-in low voltage protection besides just a low voltage warning).
I do like lights that have a way to keep the switch's internal LED illuminated while the light is off because it helps me find the light in the dark. But please provide an option to turn this feature on and off and do not make it too bright or breathing.
I also agree with forum member AEDe that Turbo should not be in the standard mode cycle (unless is it sustainable for more than a few minutes) and agree with AEDe that it would be innovative to have a more convenient way to very easily change between "Spotlight and Floodlight on" "Spotlight only", or "Floodlight only".
