A19 LED Bulb with Dusk to Dawn Photocell Sensor DUSK TO DAWN – This A19 LED bulb includes a photocell sensor that detects light levels and turns on automatically when the sun goes down. Simply keep your light switch on and let the sensor do the rest. Note: This bulb is non-dimmable. VERSATILITY – This bulb is damp rated and dust-tight to provide reliable bright light in any weather. It is suitable for outdoor applications such as covered driveways, patios, porches, decks or in string light decorations. UL-Certified - We uphold the highest standards for all our products by testing each product for optimal performance and safety. Our A19 LED Dusk to Dawn lights also contain no mercury and don't emit UV or IR. SUNCO BENEFITS - 5 Year Protection! Sunco is proudly based in the USA, offering quality products at affordable prices backed by industry-leading warranties and knowledgeable support specialists. A19 D2D