LED A19 Humancentric Light Bulb Sylvania 78781 ULTRA LED Night and Day lamp allows for management of blue light exposure from low to high with a flick of an On/Off wall/lamp switch.Easy operation, no need for wireless management devices It provides the options of emitting a natural 3000K in the morning to simulate a sunrise and wake people up gradually, a cool 6500K in the afternoon to create alertness and improve cognitive functioning, and a warm 2000K at night to help your body maintain its natural sleep-wake cycle. The Night and Day lamp can also be used to create different moods. Consumers have the option of using cool, crisp lighting in their work space, or natural, warm lighting in their living room. People can easily customize the lamp to their daily needs.