The visible blue light has a wavelength of about 475 nm. Because the blue wavelengths are shorter in the visible spectrum, they are scattered more efficiently by the molecules in the atmosphere. This causes the sky to appear blue.While light of any kind can suppress the secretion of melatonin, blue light does so more powerfully.Harvard researchers and their colleagues conducted an experiment comparing the effects of 6.5 hours of exposure to blue light to exposure to green light of comparable brightness. The blue light suppressed melatonin for about twice as long as the green light and shifted circadian rhythms by twice as much (3 hours vs. 1.5 hours).
Blue light is light that is emitted from electronic devices such as televisions, computers, tablets, and mobile phones. Unfortunately, we may not realize that this light may be what is keeping us up at night. Blue light slows the production of melatonin and makes it harder to fall asleep at bedtime. Moreover, scientifically Blue Light has wavelengths in the range of 381 to 500nm. It is also referred to as near UV, or high energy visible light, which will do harm to our eyes.
Blue light, which is part of the visible light spectrum, reaches deeper into the eye and its cumulative effect can cause damage to the retina. Furthermore, in certain wavelengths, blue light is implicated in the develop ment of age-related macular degeneration (AMD).1-3 The amount of exposure to blue light varies, depending on the time of day, the location and the season. The average proportion of blue light that's found in sunlight during the day is between 25% to 30%. Even on a cloudy day, up to 80% of the sun's UV rays can pass through the clouds.