I thought it would be pretty cool and a challenge to make my sister a little light she could keep in her purse. This little tin only measured in at 2.3"x1.6"x.6".
I wanted to do something a little different and utilize the Led's I had bought for my car. I also wanted to have it set-up where replacing the lamp would be a snap. The bulb is a 12v 9mm bayonet twist on style. I don't recall the wattage of the bulb...but its bright! I'm pretty surprised that the battery is hanging in there longer than I expected. Definitely not made to be a primary light, just a convenient bright little light when needed.
Here are the parts I used:
12v 9mm bayonet led (as mentioned above)
Miniature bayonet base (Radio Shack 272-0355)
MN 21/23 Battery Holder
MN 21/23 12v Battery
Sub-Mini push button switch (Radio Shack 275-1571)