I voted.
… more modes the merrier 
#1, since 100 lm is too close to 400 lm.
Option 3. 100 lumens is to much. More even modespacing sounds right, but you probably won’t even notice the difference. Might give longer runtimes though.
Since human brightness perception is not linear I voted for Option #1 (difference between 350 and 400 probably won´t be noticeable)
I voted! 
Why Feb. 28th?
Voted for option #3. For better runtime.
Voted #3 , to be coherent with the previous conversation and vote 
I have a ramp calculator which can be used to calculate evenly-spaced levels on a few different perceptual scales, if anyone wants guidance on how many lumens to aim for at each level.
On a light which goes up to 700 lumens, I’d normally use 5 levels… 0.25 / 10 / 70 / 260 / 700 lm.
But it sounds like that’s not an option. So within the constraint of 1 to 700 lm in a maximum of 5 steps (including burst), I’d suggest something more like… 1 / 20 / 100 / 300 / 700 lm.
If it needs to hit 400 lm for some reason, it could be… 1 / 25 / 133 / 400 / 700 lm.
Or if it can only use 3 modes plus burst, I’d probably go with 1 / 20 / 150 / 700 lm.
If it helps, the first one was calculated with a command line like this:
./level_calc.py 4.18 1 5 7135 1 0.25 700
1: visually 0.72 (0.25 lm): 1.00/255
2: visually 1.74 (10.05 lm): 4.56/255
3: visually 2.76 (69.20 lm): 26.03/255
4: visually 3.77 (257.79 lm): 94.48/255
5: visually 4.79 (700.00 lm): 255.00/255
PWM1 values: 1,5,26,94,255
On most EDC-style lights I only actually use a few levels… ~10 lumens, ~0.25 lumens, and something in the range of 50 to 100 lumens. But usually just 10. And occasionally turbo, but not very often. So I try to make sure those are included in the ramp. But if the lowest mode is 1 lumen instead of having a true moon level, the entire thing gets shifted upward to avoid having modes too close together. So it hits about 20 or 25 lumens instead.
Voted option 3
option 2 for me
I voted for last option! Lower middle modes I don’t mind. It’s the max that always matters.
Voted
- since existing is not optional…
I voted option 1. The spacing is good enough that way, and in my experience more modes just means you spend more time getting where you need to be. Even four modes on my EDC lights has started to bother me. With proper spacing, three is enough.
Just voted #1.
I’d like 40 lumens on medium instead of 100 because it’s still high enough after the low 1 lumen.
Voted
Do what TK says. And get a sub lumen moonlight.
Voted
Picked option 3 for run time, given the size of the light.
I went with 3.
The difference between 350 and 400 would be nigh imperceptible, even 2 lights side-by-side, yet would at least give marginally more runtime.
I voted. 1 / 20 / 150 / 700 would be my preference within these constraints.
i voted
for #2
but you guys should study anduril UI
seriously
it’s the best
2nd runner up is BLF A6 ui
wle
6 months seemed reasonable.