If you can find one or wait til the new ones come out a recent rumor says fall of this year an HDS would be a great choice, they arent cheap but it will be a good small bright light and probably has one of the lowest lows available without using a lower powered LED ie. 5mm
Another vote for the AAA based LiteFlux LF-2 CRE. Very small and easily fits in any pocket. Way easier to carry than a CR123 light. It ran for over seven days on its lowest low and still had useful output (if dark adapted) at that level. I program mine to come on at very low and a half turn more and it is at 50% brightness and quite bright. You can set the two levels at whatever output level you want.
My advice with this light is to set your levels and then just use it as a simple two-stage light. It is the best and easiest UI if you just ignore all the other features. It is also one of the only lights that you tighten to turn off which is much preferable, IMO, to loosening. I love mine.
The LiteFlux LF-2 is now available to CPFers (for seemingly a limited time) at $45.00 instead of the regular price of $55.00 and shortly you will have the choice of having it with a Cree or Seoul LED.
The Draco is very small, and since it has a Flupic, there are 10 levels to choose from.
At the lowest you can look directly at the emitter without discomfort.
Perfect for late-night bathroom trips, etc.
Actually I saw a thread
yesterday they are doing a special on the LF2 for $45 your choice of Seoul or
Cree. I'm going to pick one up myself. Whoops, didn't see Calina's post.
perhaps one of those lights powered from a nine volt battery. i can't remember the name of them, but it had a stand-by mode where the led is powered very dim and for three years from a single battery.
found the name again on the led museum. it's the PALight survival.
one of those serves as nightlight in our bedroom and it's enough to find your way but not too much to wake someone up.