1xAA Light recommendations

[recycledelectrons]

http://store.advancedmart.com/ghiial12ulbr.html
I've had one as my backup EDC for more than a decade.
My only caution is that it can twist on and run down the battery, so I put an o-ring between the tail-cap and the battery that I remove when I need it (once a year.)

 

[Gunner12]

The Zebralight SC51 could work well. Bright for a 1 AA light, small, and has a good clip too. Also comes in Neutral and warm white.

If you don't need a clickie, a 4sevens Quark Mini is pretty small.