Upgrade to LED with these S14 filament string light bulbs with a medium base (E26). These Dimmable bulbs are an energy efficient replacement for incandescent bulbs. At 4 watts, they use 86% less energy while providing as much light as a traditional 25 watts bulb at a 340 lumens output. Long life LED technology means up to 15,000 hours of reliable service that is flicker free and instant on at full brightness, unlike compact fluorescent bulbs. These lamps are UL listed for damp location installation and contain no mercury or other harmful chemicals.