Sylvania 20942 - CF13DD/E/827/ECO/BL/1 Double Tube 4 Pin Base Compact Fluorescent Light Bulb For use on dimming and electronic ballasts. End-of-life shut down protectionSave energy costs by replacing incandescent bulbs with fluorescent equivalents. Compact fluorescent lamp with 120 volt integral ballast, 82 CRI. Meets FCC, CULUS and Energy Star standards. 13 watt - 4 pin G24q-1 base, 900 lumens, 12,000 average life hours