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 10 watts, they use less energy while providing as much light as a traditional 60 watts bulb at a 800-lumen output and have 90 cri. Long life led technology means up to 25,000 hours of reliable service that is flicker free and instant on at full brightness unlike compact fluorescent bulbs. They are energy star certified, and ul listed for damp location installation and contain no mercury or other harmful chemicals. These bulbs are title 20 certified, they meet california’s title 20 criteria