Consider limiting the amount of time your lights are on using a timer. For example, turn lights off at 11pm. For the most control, there are astronomical timers that use your lattitude, longitude, and date to calculate when sunset and sunrise occur. You can truly "set it and forget it" with these timers and turn your lights on for just a few hours after sunset and for before sunrise. No need to reprogram them as the days get longer. Pretty cool!
Here's where you can purchase these awesome timer switches: Leviton, GE SunSmart