A blue Fenix E01 on her key ring.
When she needs a light around the house for any purpose, she just grabs one of my EDC lights from a flip-top wooden presentation box near the kitchen, where I keep my smaller lights, a few pocket knives and watches, truck keys, etc. Usually she just grabs a Mini Mag AA, or a Streamlight Stylus, but last night she grabbed my Surefire E1b to look around for wrapping paper in the hall closet. After a few minutes of seeing the E1b burning away on high mode, I asked her if she could switch it to low, for dark closet duties. Her response was something like, "Come on, flashlights are for using."
I couldn't argue with that. Maybe she'll get me some CR123 primaries for Christmas.