October 15, 2011
Do White LEDs Disrupt Our Biological Clocks?
Ben Stein, Inside Science
(ISNS) -- You come into contact every day with light-emitting diodes (LEDs) -- they illuminate alarm clocks, new televisions, traffic lights, and smartphone displays. Increasingly, you will see white-light versions of LEDs becoming available for energy-efficient home lighting, car headlights, and streetlamps.
What you may not know is that the most common form of white LEDs -- which emit a spectrum of colors, including blue light -- is inadvertently effective at sending signals to our brain’s biological clock, which regulates daily activities such as sleep.