Make your home SMART! Install ENERGY STAR Greenlite Dusk-to-Dawn Security LED A19 Bulbs. Greenlite's Dusk-to-Dawn Sensor technology is care-free and perfect for outdoor applications. Create a lived-in and welcoming appearance to your home while saving energy. These Dusk-to-Dawn Sensor LED Bulbs are up to 85% more energy efficient than standard security light bulbs, and produce museum quality bright white (3000K) light which will instantly beautify and brighten your home. These Security LED Bulbs install right from the box, no assembly required.