Create a lived-in and welcoming appearance to your home while saving energy. Install Greenlite Dusk-to-Dawn Security LED A19 Bulbs. Greenlite's Dusk-to-Dawn Sensor technology is care-free and perfect for outdoor applications. 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.