This is a favorite category for me...single AA lights that run on a 14500. At present, my favorite is the Eagtac D25A clicky with XP-G R4 neutral/warmish emitter. It has a great, strong, very deep pocket clip on it as well, which is wonderful. Shown on the right, below.
While the SWM V11R (center in the pic) with extension for AA cells (not shown) is an exceptionally well made light, I find it bulkier than I would prefer and also find the infinite output ring not as much to my liking as I had imagined. I think three or four well spaced output levels, quickly available through clicking is more useful than the capability of precisely dialing up and down with the ring.
The emitter in my D25A clicky XP-G R4 is billed as being "neutral", but my copy has a very noticeable warm tint to it, which I really like, a LOT. No idea what the tint bin is. Anyone here know?
For comparison of size, Surefire 3P (Fivemega 3P body), Sunwayman V11R, and EagTac D25A clicky:
I am eager to obtain a D25A mini, to go with the D25A clicky. I think that little thing would be an awesome light and so easy to carry without even knowing it's there.