While generally people are well aware of the dangers of UV light, such as sunburn and skin cancer, the general knowledge and awareness of blue light is very small. The exception to this seems to be Japan, where the blue light awareness appears to be quite high. A few days ago, while doing some research, I came across some interesting facts related to blue light in Japan.
Blue light is part of to the visible light spectrum and has a short wavelength and high energy. The main source of blue light is the sun, but there are also many other non-natural sources of blue light, such as computer screens, screens of smartphones and tablets, street lights, billboards, modern room lighting, and many more. Nightly artificial blue light exposure interferes with our circadian rhythm by suppressing the natural melatonin production, which can make it difficult to fall asleep.