Get energized or wind down naturally with the Feit Electric BR30/HLTH/LEDI/4 circadian rhythm light bulb. This innovative dual-mode Circadian LED light bulb offers the ability to control and personalize the spectrum of the lighting to deliver optimal daytime productivity and natural sleep enhancement in one light. Easily change light modes by turning the bulb on/off. Transition to the natural light according to the natural progression of the sun to support your body's natural circadian rhythm. Soft White 2700K light mimics sunrise and sunset, easing you into the morning and providing warm, inviting light for relaxing at the end of the day. Daylight 5000K light provides an invigorating light that helps energize you for getting work done and seeing in fine detail during activities like cooking and homework. Circadian bulbs use LED technology that lasts 15,000 hours, for up to 13.7 years of reliable lighting.