Get energized or wind down with the Feit Electric Day & Night Circadian + Night Light LED Medium Base (E26) Light Bulb. This dual-mode light bulb offers the ability to change the light according to the natural movement of the sun to support your body’s natural circadian rhythm. Easily change light modes by turning the bulb on/off using a wall light switch. Set the Night Light mode at night to keep walkways and sharp corners illuminated without disturbing sleep. Control the spectrum of light with this day and night bulb to deliver daytime productivity and natural sleep enhancement in one light.