Uh... confession time.
Until this past week, I had incandescent light bulbs in the two lights of mine that are nearly constantly on. Oh no!
You see, we had fluorescent bulbs, but then eventually they died. And when we replaced them, we just used the incandescent bulbs that we had in the house to build my dehydrator. But, eventually they died, and now we finally replaced them with the much more energy efficient fluorescent bulb.
Did you know that you can save 30 dollars per fluorescent bulb that you use? These bulbs use less electricity to give you more light than the standard incandescent. (I just peeked at our new bulb. Its 28 watts and gives off the light of an 100 watt bulb.) That means you use less electricity (and hence, pay less) to provide more light.
Fluorescent light bulbs do cost more to buy than incandescent, but this is one instance in which it pays to spend more money upfront to save more money in the long run. If you don't have the money to payout to switch all your bulbs, pick which lights are on most and replace just those. (We already had fluorescents in our living room/dining room and bedroom. We almost always have our bathroom lights on because Lee is scared to sleep in the dark, and that bathroom light works as a night-light for the rest of our house.)
And of course, even more energy savings will be had if you make sure to turn off your lights when they're not in use. But more on that another time!