About energy efficiency
Saving lighting energy requires either reducing electricity consumed by the light bulbs and light fixtures or reducing the length of time that the lights are on.
This can be accomplished by:
Reducing the amount of time that lights are on. This can be accomplished by using dimmers and other lighting controls, and educating family members to turn off unneeded lights.
Lowering wattage, which involves replacing bulbs or entire fixtures with bulbs and fixtures that provide the same amount or greater amounts of light but with reduced electricity usage.
Today, this can be accomplished most easily by replacing inefficient incandescent bulbs with incandescent/halogen bulbs or compact fluorescent bulbs.