We got tired of fumbling around a lot of switches to find the lights for the kitchen and outside. It's beyond me that the manufacture would put the light switches in a dark closet. We tried to use the light switch for the fan/light in the living room but then we'd ended up fumbling in the dark to find the chain to pull for the lights.
I started with LED car light strips from WalMart. They're called Custom Accessories Daytime Running Light LED Strip, White, 2pc and are very bright. They also come with 10' of wire.
Next step was finding a magnetic switch so when the closet door is opened, the lights automatically come on. It's best to get the NO/NC kind to make it easier to wire into 12V.
Wire this to the LED lights and I used the 12V coming from the electrical panel. I used double sided sticky tape on both pieces so I didn't have to put any holes in the panel or my closet door.
Elemental LED has a good library on how to wire LEDs to 12V on their web site.
LED Lights, LED Strip Lights, Color Changing LED Light Strips - ElementalLED.com
Completed project. Now when we open the closet, we have instant light to show us our electrical panel and the lights turn off as soon as the magnet gets close to my switch.