Cost Savings:
Although more expensive initially, CFLs save money in the long run because they use much less energy than standard bulbs. And they last up to 10 times longer, reducing your overall lighting expense. Some sources say that a single 18 watt CFL used in place of a 75 watt incandescent will save 570 kilowatt hours of electricity over its lifetime. Depending on the cost of energy in an area, this equates to $50 or more in savings!
Environmental Benefits:
EnergyStar.Gov says that if every American home replaced just one light bulb with an ENERGY STAR qualified CFL, we would save enough energy to light more than 3 million homes for a year and prevent green house gases equivalent to the emissions of more than 800,000 cars. Saving energy means reducing carbon dioxide (CO2), sulfur dioxide, and other pollutants.