Dusk to Dawn LED light bulbs are equipped with a built in light sensor that turns the lights on automatically when the sun goes down and turns the light off when the sun rises. Suitable for indoor or outdoor use, these bulbs have standard base for most fixtures. Not for use with products. These Dusk to Dawn Sensor bulbs provide 800 Lumenâs of soft white light, equivalent to watt incandescents with 75% less energy use. With 2700-Kelvin soft white light, these light bulbs offer the comfort and security you need in a with the benefits of long life and energy savings you want. Best-in-class LEDs provide turn on instantly with energy-efficient flicker-free, natural light that won't degrade over time. Unlike cheaper imitations, LED offers clean, natural lighting with exceptional clarity. LED light bulbs last up to 10X longer than incandescent and halogen bulbs. Unlike fluorescent and compact fluorescent bulbs,LEDs are mercury-free so they don't contribute to hazardous waste.