Controling the lights of your home has benefit of not only being able to turn them on and off at will, but to be able to control them so precisely that it can save you money. You can have a complete home lighting system installed and control all the lights in your home from a control panel or even a tablet or smart phone nowadays. Also you are normally able to program when the lights should be on or off and see what power they use.
The other side of the coin is the style of bulb you use. There are many new options to choose from that are much more efficient thent he older style of Incandescent bulbs. There is the Compact Fluorescent Lamp or CFL. This bulb uses less power for the same light produced and uses it more efficiently and last much longer, as much as fifteen times then the same style Incandescent. The most efficient bulb style though is currently the light-emitting diode or LED. They last longer then both the Incandescent and CFL bulbs.