Researchers at the University of Basel have discovered that computer screens with a LED backlight unit (BLU) have a greater effect on a person's sleepiness and cognitive performance, as compared to other types of BLUs. LEDs emit more energy at a wavelength of around 464 nanometers, which has a strong effect on the circadian hormone melatonin's level as well as on cognitive performance. Tests showed that people who sat in front of an LED display for five hours in the evening had a 20% faster reaction time and had better cognitive abilities according to other tests as well. The researchers suggest creating BLUs with a variable spectral power distribution so that sleep cycles are not disturbed. If you are an avid video gamer, consider upgrading to an LED display.
Read the article at this link: http://tinyurl.com/03-110325.
Source: Science-Switzerland, February – March 2011.