Picture of A simple 12V Light
Hello maker, 
in this instructable I'm going to show you how I builded a simple LED lamp to light the inside of a bicycle trailer. It works like the light in a refrigerator, if the door is open, the light is on, if it is closed, the light is off. It is made ​​from parts that I had lying around.

Step 1: Parts

Picture of Parts
I used some old parts, I found in my workshop:
-2 pieces of sanded acrylic glass
-a lever
-an off push button
-4 peaces of white LED strip (120 LED's per m)