Blue light is not just one color but instead is infinite. Light is measured in a range of wavelengths, just like radio waves or television signals. On one end of the range is the ultra violet (UV) light. Everyone knows that UV light is bad for the eyes and all Cocoons and specialty filters block the entire range of UV light. On the other end of the range is the infrared light often associated with television (and other) remote controls. As people, we can only see the light between the UV and infrared light. This is called the visible spectrum (and not all of us can even see that). Scientifically, the visible light wavelengths range from 380 to 800 nanometers(nm). The lower the number on the range, the shorter the wavelength of the light and the more energy the light carries with it. Blue light is at the lower end of this visible spectrum with wavelengths ranging between 400 and 500nm.
Focusing on the blue light range alone, on the low end is the blue-violet light which combines blue light with the really bad UV light. This is generally understood to be the bad blue light. Some sources say the worst blue light exists in the 411-420nm range. As you move to the longer blue wavelengths, the light becomes blue-turquoise in color. This is the good blue light.
According to a 2014 article published in the Review of Optometry, “The labeled blue-turquoise light range, which is from 465nm to 495nm, is essential to our vision, the function of our pupillary reflex, and in general to human health.” Ultimately, “this blue-turquoise light really plays a vital role in the general health of the individual.” Based on this and other research, it is important to have some blue light exposure. The Cocoons computer glasses with the Purify Lens System are balanced to ensure that the bad blue light is filtered and the good blue passes through.