Use advanced-technology lighting outdoors

Besides replacing standard incandescent bulbs with LEDs, you can save even more energy by installing ENERGY STAR certified outdoor fixtures. They use motion sensors or photocells to turns on lights only at night. Astronomic timers offer the ability to turn off lights at dawn and turn them on at dusk.

Skill level: Advanced
Outdoor lighting using these advanced technologies can be found at most home improvement and lighting stores. And many LEDs will fit into existing outdoor fixtures.
Cost range: $9-$315
ENERGY STAR fixtures and bulbs are rated for outdoor use and pay for themselves over time in energy savings and longer bulb life.
Savings: Varies
Outdoor lights are some of the most frequently used fixtures in a home, so this is a good place to start saving energy. Just look for the ENERGY STAR label on products or packaging.