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Light from Devices


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#1 biferibiferi

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Posted 19 April 2015 - 09:21 PM

I know they say the Light from Tablets Cell Phones and Computers will keep you up at night because of the BLUE Light.

 

So they say not to check your Cell Phone or Tablets at night befor going to Bed.

 

But if you are checking e mail even if it is on your cell phone you are looking at a White page.

 

What do they meen a Blue light?



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#2 Platypus

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Posted 19 April 2015 - 10:11 PM

White light contains blue in its spectrum.

 

http://astro-canada.ca/_en/a3200.php

 

How much blue will depend on the type of white it is, usually expressed as a colour temperature, but also can be given a name such as daylight. Screen backlighting that appears nice and bright typically has quite a lot of blue in it.

 

The concern is that the eye receiving stimulus of blue light causes production of Melatonin that impacts on circadian rhythms, and it's believed that doing this at night is likely to cause sleeplessness. The thinking is that holding a small device that probably has a bright screen to allow viewing outdoors close to your eyes to read emails could deliver a fair dose of blue light.


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