On 2009.12.28 23:46, Tomas wrote:
> p.s. Ir dar tie patys virkaudavo del purkshtuku su melynais diodais.

The refractive index for blue light is enough different from red and 
green that when they are in focus, the blue is slightly out of focus 
(chromatic aberration). For an "off the wall" example of this defocusing 
effect on blue light, try viewing a hologram with a mercury vapor lamp. 
You will get three images with the dominant green, orange and blue lines 
of mercury, but the blue image looks less focused than the other two.

Ir čia: http://texyt.com/bright+blue+leds+annoyance+health+risks
Are they moaning about nothing?

What's all the fuss about blue LEDs? Surely a light is just a light, no 
matter what the color. How can there be a difference between blue and 
red, green, or amber?

In fact, blue light causes greater eyestrain and fatigue than other 
colors. It is harder for the eye to focus and causes greater glare and 
dazzle effects. It can also interfere with our internal body clocks, 
disrupting sleep patterns. Some researchers believe that even very low 
levels of blue light during sleep might weaken the immune system and 
have serious negative implications for health.