The second way to save money in lighting expenses is another one you have heard over and over again: turn off the lights when you leave the room. The difference here, however, will be that you
wont have to, it will all be automatic. The easiest and most professional way to retrofit your home with automatic light switches is to buy motion sensitive switches. These are fairly cheap and are easy to install with minimal electrical knowledge. I recommend buying a cheap switch because it will pay for itself in energy savings more quickly, but I do not recommend buying the cheapest switch you can find because these are often very low quality and are not reliable. I recommend searching http://www.amazon.com
or another online shopping site to find the greatest selection.
There is one cautionary note regarding the use of motion sensitive light switches: it is generally not a good idea to use them with compact fluorescent lights. Repeatedly switching on and off any light bulb will lower its lifespan, however, compact florescent bulbs are particularly vulnerable to this effect. In fact, a compact florescence's life can be cut by 85% making the cost of replacing the bulb far higher than the savings in energy gained by turning it off. So, if you plan to install a motion sensitive light switch with compact florescent light bulbs, make sure that it is in a room that you do not walk in and out of frequently. Incandescent or other light bulbs should always be turned off when not in use however. Because incandescent light bulbs are so inefficient and cheap to replace, it is advantageous to turn off the lights whenever a room is not occupied.
A great video guide for installing motion sensitive light switches can be found here: Installation Video Instructions
. If you already know to to install light switches, just remember one thing: TURN OFF THE POWER BEFORE YOU START WORKING, it could save your life, and, like the video says, "if in doubt, consult a professional."