MOM’s Organic Market has switched over from using traditional incandescent lights to LED bulbs in all seven of its stores. MOM’s operates stores in Alexandria, Va., and Bowie, College Park, Frederick, Jessup, Rockville and Timonium, Md. The grocer is slated open a location in Herndon, Va., next month, and stores in Merrifield, Va., and Waldorf, Md., in 2012. The LEDs deployed at MOM’s last an average of 25,000 hours and use 18 watts per bulb. The old incandescent bulbs lasted about 3,000 hours and used an average of more than 60 watts ...