Step 1: Wiring

Wire your components like the image above. Using a breadboard is optional, if you choose not to just make sure to connect the leads of each component to each other for those that are in the same line. Be sure to ground and power both sides of the bread board using your Arduino, and insure that everything is connect properly before running your program.

Step 2: Coding

Code the Arduino so that depending on the amount of light the LDR receives the light bulb will turn on when the amount of light you have is a a minimum and off when you have a large amount of light.