I'll throw out there that my far and away favorite UI in a light is combined with the worst mode sequence and cheesy tail cap and I've been searching to find a modder to fix that!
Seriously - I'd probably pay $600 for this $100 light if someone could fine tune the details. As it is, I wouldn't give more than $40 for it.
The thrunight scorpion/lynx - Supbeam T10.
I loved how easy it was to operate one handed. Once I got used to it it was so easy to hold and switch modes nearly instantly with my thumb in the most natural position turning the adjuster wheel. It made every other UI I have including control rings seems so clunkly and akward by comparison.
My lambda light I can sort of adjust with one hand without thinking about it.
All the other control ring lights I have I have to readjust my grip and think about it to change modes one handed but the scorpion - no grip adjustment, no thought going into it, no straining, just naturally turning the wheel on the back to easily go thru the modes.
BUT the mode sequence is asinine and the switch so cheesey.
Starting from all the way counter clockwise you have:
1.) a half baked lock out that sometimes works, sometimes doesn't, often the wheel gets stuck here. Best to avoid.
2.) Low*
3.) Firefly
4.) Strobe
5.) momentary max
Or if you were thinking in numbers it goes: Junk, 4,1,spaz,10. A really unique idea I have for ordering 5 well spaced modes would be something like: 1,2,3,4,5.
But for excitement Thrunite likes: 3,1,5,2,4 😀
I work for an NGO doing relief work in war/disaster areas and I'm often in hot combat zones. I think firefly is one of the most useful/helpful modes. When in the jungle at night in the pitch black but you need to see something firefly is almost always more than enough but hopefully not too much when your life depends on keeping your position/presence secret. (Long before multi mode flashlights and "firefly" mode SF/recon guys always depend on it - you just do something different like use the back light from your watch to read a map - many guys still do those kind of things and when they see a light with firefly mode they get envious!)
The scorpion puts firefly right next to strobe making it too dangerous to attempt to use at night. You can be fairly confident you'll get max when you want it as long as the wheel didn't get stuck in the lock position and you mistakenly thought it was all the way clockwise.
So I guess what I'm saying is I'm really looking for ALL of the above:
1. A great UI system
2. A logical/intuitive sequencing of the modes
3. Well spaced modes.
I know all of us have different needs/desires so my hope would be to find a light close enough to what I was looking for and then have a modder take it from there.
Add to that the switch comes on insanely easy when your fingertips brush over it - so the batteries are usually dead.