Blue light is a colour in the visible light spectrum which falls within the 400-500nm range.
Blue light in the range of 400-450nm can cause eye damage such as macular degeneration. Blue and green light from 450-550nm has a direct effect on the the brain's ability to secrete melatonin, with a lack of melatonin causing issues for us in both falling and staying asleep.
Today we are surrounded by this harmful blue light from all artificial light sources. This includes computer screens, TVs, smart phones, tablets and conventional LED lighting in your home. Even though we refer to this harmful artificial light as 'blue light' does not always mean the light you notice will appear visibly blue.
For more info on blue light and its effects please read our blog post on What is Blue Light.
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