The OSRAM LIGHTIFY™ Tunable White 60 lightbulbs lets you tailor warmth and intensity

http://www.osram.com/osram_com/products/led-technology/lightify/lightify-home/lightify-lamps/index.jsp

http://www.belkin.com/us/73674/p/P-73674/

The OSRAM LIGHTIFY™ Tunable White 60 Bulb lets you tailor the warmth and intensity of your home's lighting. This smart light bulb has an adjustable temperature range of 2,700 to 6,500 Kelvin, allowing you to switch between warm and cool shades of white. Choose a cooler temperature to add a refreshing splash of bluish white to any room, or warm the lighting for a more relaxing atmosphere. The bulb is also dimmable, so you can adjust the light to suit your mood.