Compact Fluorescent Lamps(CFL) use at least two-thirds less energy than standard incandescent bulbs to provide the same amount of light, and they last up to 10 times longer. They are the most widely available and cheapest energy saving light bulbs. CFL also generate 70 percent less heat, so they are safer to operate and can also reduce energy costs associated with cooling homes and offices.CFL are available in many different sizes and shapes to fit in almost any fixture.