CFL stands for compact floursecent lightbulbs, while LED stands for light emitting diode. Although both are more energy efficient than a traditional incandescent lightbulb. CFLS use one-fifth to one-third of the electricity and last eight to fifteen times longer. Unfortunately because CFLS are a flourscent lamp they contain toxic mercury so you need to recycle them carefully. LEDs are the most energy efficient, they use more than 75% less energy and last 25 times longer than incandescent lighting and the components don’t contain products that are harmful to the environment. For ideas of how to cut your electricity bill read more here.