October 15, 2011

Do White LEDs Disrupt Our Biological Clocks?

Ben Stein, Inside Science

AP Photo
(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. 
The realization of the body's special sensitivity to blue light has spurred scientific investigations of whether the light can disrupt our circadian rhythms,...
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TAGGED: Light Bulbs, Light-emitting Diodes, Biological Clock, Circadian Rhythm