I am not going to detail all the reasons to go to more energy efficient light technologies, but I will say, your home is filled with light bulbs (a lot more than you think!) and the choices you make concerning light technology have ripple effects in both your monthly electric bills and in your replacement time and costs. Of course, CFL's are more expensive than incandescent bulbs and LED are more expensive than CFL bulbs. But these newer bulbs are guaranteed to last longer and to use a lot less energy. In the case of LED bulbs, WAY less energy than an incandescent bulb.
There are some reported down sides to CFL bulbs. Because they have mercury inside the bulb, if the curly part of the bulb breaks, it can let toxic mercury out into your home. I don't know a lot about this, but it sounds like something that I don't want in my home--especially in my kids rooms. So, I have started replacing my CFL bulbs with LED bulbs in the nursery and other rooms where my boys spend a lot of time--just in case. I have also started putting LED bulbs into rooms where the lights tend to stay on all day long--like our home office and work spaces. It is a gradual transition for us, but one that I notice a difference in the technology.
One of the big differences that I really like with LED bulbs is how fast they illuminate the room. This has been one of my pet peeve's with CFL bulbs--they take almost 1 minute to warm up. In places where I want instant lighting--like a hall way where the thermostat is located, waiting for the CFL to warm up while I check the thermostat in the middle of the night is not fun. And because Austin has fast changing weather conditions, programmed theromostats just don't keep up with the changes fast enough (moving from heat in the morning, to AC in the afternoon and back to the heater--all in one day!).
So, if you are considering LED and have not made the switch, check it out. And do your home work; there are all kinds of LED bulbs out there. It is a whole new world. You can get them cheaper on Amazon.com below!