This is probably heading down the wrong alley, but what about the
Pentagon MOLLE Light? It's a bit out of the price range, but here's why I like it:
1. It's super reliable.
2. The angle head design is ergonomic.
3. Momentary/Click-On switch is totally silent (you literally have to hold it to your ear to hear it click)
4. 40 advertised lumens, in my opinion, is a bit of a stretch. When comparing it to my Novatac 120P set on 15 lumens, they're very close.
5. Clip is easily removable, and head has provision for neck lanyard.
6. Comes with blue filter threaded on tailcap, which significantly lowers the total output, ie. less likely to wake someone.
7. Runs on 1AA alkaline for 3 hours.
Here's something to consider, just because a single mode is desired, doesn't mean it has to be dim, given the intended purpose. I'd opt for a higher output light, and utilize ceiling bounce to diffuse the beam. That way, no one wakes up, and there's more light if needed. Just my .02
The Fenix E01 would also be a nice choice, I agree with the previous post.