The new technology bulbs use CFL (Compact Fluorescent Lamps) technology and save power. If you replace a normal incandescent lamp with a CFL lamp, though the initial cost is higher, the CFL consumes only one fourth of the power compared to a normal lamp. Apart from lower power costs, CFL lamps have much longer life. In addition, they help in reducing green emissions too, helping the ecological balance. Read more about energy saving light bulbs here.