Upgrade to led with these standard a19 shape household light bulbs with a gu24 twist and lock base. These dimmable bulbs are an energy efficient replacement for incandescent bulbs. At 14 watts, they use less energy while providing as much light as a traditional 100 watts bulb at a 1500-lumen 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. They are ul listed for damp location installation and contain no mercury or other harmful chemicals.