One thing to consider with "moonlight modes" etc, is that, so far, everyone is talking about lumens/sub-lumen modes, etc.
I have a LOT of lights with different beam patterns, and its a DRAMATICALLY different experience to use a tighter beam's 0.1 lumen vs a floody beam's 0.1 lumens.
The REASON is that you can't SEE lumens, you are really seeing the lux.
The lux you get from 0.1 lumens and a tight beam will be very different from the lux you see from a floody beam's 0.1 lumens.
So if comparing the resultant abilities to say, read a sign or a book or follow a path, etc....the DISTANCE from your eyes to what you are trying to see will change the lux you see dramatically (Inverse square law), and the tightness of the beam/beam angle will also dramatically change the lux you see...as that fraction of a lumen is spread out differently, and so forth.
IE: I might see my target more brightly with 0.1 lumen than with 1.0 lumen, if the 0.1 lumen's beam angle is smaller, or 1 lumen can produce dimmer lighting than 0.1 lumen....etc. So a discussion of sub/low-lumen level is without context typically...and, I just wanted to point this out.