I'm no expert on lights, but I do complex Product Development for my profession. If we are going to be scientific about this, you need to list your requirements first and then try to design to meet them. You seem to be too focused on design before settling on a firm set of requirements. Also, if this is serious, take the time to help us understand your usage in more detail, if you can. A lack of knowledge of its application will yield poorer results.
For instance, you seem convinced that you need a lot of batteries. You don't need batteries, you need your light to have "X" Power and "Y" Run time. Your battery needs will be derived from that (and perhaps other factors). If it is storage, why does it have to be in the light as opposed to a backpack or pocket?
Also, I have not heard why a separate light will not meet your requirements. Are you sure that using a 10lb, 4 ft light is workable for what you need (ie. can you aim it reliably in what sounds like a stressful situation?).
You have described the form factor well - length, weight, rigidity, etc, including examples of it's usage. What do you need in your light?
- Lumens
- Throw distance
- UI Functions - You mentioned a low setting for walking around and a Max setting for defense (you mention 1 sec, then you say 5 secs, which do you need?). Then you mentioned a 360 light. What is this? What about strobes? Again, I think better details on the Use Case are needed.
- Battery life
- Reliability
- Etc.
BTW, is this upcoming book at all similar to "The Mismeasure of Man" by S.J. Gould? I read this in an Honors class in Primate Behavior many years ago that I loved.