About Dusk to Dawn Sensor Light bulb. Dusk to dawn sensor light bulb, it don’t need extra sensor socket and base, the bulb will be auto light on and light off by itself, the light sensor function according to built in sensor parts sensor outside surrounding light strong(light off) or week(light on). When it’s outside surrounding light <30lux (brightness intensity, ), bulb will be light on automatic. when surrounding light >70lux (brightness intensity), bulb will be auto light off. Specification: 6W 600lm equivalent 60W incandescent/Edison bulb. Parameter: 5.12 Inch(H)* 2.28 Inch(W) Cover: Clear glass cover Base: E26 medium screw base. Working Voltage: AC110-130V/60Hz. Working Temperature: -4℉-104℉ Color : Warm White 2700K±200K. Lifetime: 15000h, Lumes: 600lm Dimming: No-Dimmable, Package: 4 x 6W dusk to dawn light bulb. Warranty: 1 Year. Note: 1. When used with fixture, please make sure the fixture is well light transmission, then the bulb can detect outside light well and accurate. When fixture is cover is not clear enough, the light inside of fixture will be weak than outside, the bulb detect weak light, it will be not working accurate as the lamp installation without fixture. 2. It takes approximately 40s to complete this testing process. 3. Keep a distance of 1-1.5 meters when installing in parallel to prevent mutual influence. 4. This bulb NOT suggested used in the completely enclosed fixture, because this bulb working temperature must be in range of 4℉-104℉working temperature. when fixture is completely enclosed, the heat will not sink from the fixture, then inside of fixture temperature will be higher 104℉, when bulb working <-4℉ or >104℉, the lifetime will be shorten much, only 1000h or lower. 5. When used with outdoor fixture, please make sure the E26 screw base far away from any water.