When asked which bulb is more energy efficient, 3-year-old Charlie LeBlanc points to the compact florescent bulb at the Osan Air Base, Republic of Korea, Base Exchange. Airmen from the 51st Civil Engineer Squadron brought more than 700 bulbs to give away Oct. 10, but have more than 6,000 free bulbs in stock at the self-help store. These bulbs can replace any incandescent bulb in a 110-volt socket. (U.S. Air Force photo/Staff Sgt. Brian Ferguson)