I have 2 safes and mounted different light in each. In one I mounted this at the top. It has it's own switch and lights it up pretty good.
http://www.homedepot.com/Lighting-Fa...&storeId=10051
In the other on I mounted 5 halogen puck lights down one side. I have a switch at the bottom but am thinking about a motion switch so when I open the door it will come on. I would prefer to use led's but can't find any that put out enough light. They are too dim for that use.