What is Blue Light?
THE ELECTROMAGNETIC SPECTRUM
Blue light is part of the visible light in the electromagnetic spectrum and has a wavelength of approximately 380-500 nanometers. The different colours in the visible light spectrum have different energies. In the range of 500-700 nanometers we find the green, orange, yellow and the red lights, which are lower energy waves and, as such, easier on our eyes. This specially applies at night. The higher energy side of the spectrum (called HEV - High Energy Visible light) is made up of blue light, which is the strongest around 400-470 nanometers. Blue light has the shortest wavelength, but the highest energy in the visible light spectrum, which is hazardous for us in a number of ways.
BLUE LIGHT SOURCES
In short, blue light is practically everywhere. The sources of blue light include its natural source the sun, and artificial sources, such as TVs, computers, laptops, smart phones, tablets, other digital screens as well as electronic devices, and fluorescent and LED lighting.
HOW DOES BLUE LIGHT IMPACT US?
In its natural form from the sun, our body uses blue light to regulate our circadian rhythm, or in other words, our natural sleep and wake cycles. Our body clock influences how much melatonin we produce. Melatonin is the hormone that helps us sleep and is made by the pineal gland in the brain. Our melatonin production is increased when the exposure to natural blue light reduces with the sunset in the evening and decreased when it gets bright again at sunrise in morning. During the day blue light is beneficial as it helps to boost alertness, increases focus and elevates moods.
However, exposure to artificial blue light in the evening impacts our sleeping rhythm and our sleep quality by disturbing our circadian rhythm. Artificial blue light after sunset fools our body clock to think it's still bright daylight and, as a result, suppresses the production of the sleep hormone melatonin in our brain and keeps us awake and alert, which makes it harder for us to fall asleep and negatively impacts our quality of sleep.
HOW TO SOLVE THE PROBLEM?
In order to avoid the negative impact of nightly blue light exposure on our sleep, one would have to stay away from blue light sources for about 90-120 minutes before bedtime. This would mean abstinence from TV, smart phones, computers, laptops, tablets, digital screens, modern room lighting, billboards etc, which would obviously not be very practical for most of us.
Sublime Blue Light Blocking Glasses are designed exactly to eliminate that problem, namely to block our eyes from exposure to blue light in the evening and to enable the melatonin production while we are watching TV or use our computers, laptops, smart phones or tablets, for a better sleep. Sublimes come in different forms and shapes to cater for individual style preferences. We recommended to wear the Sublimes at least 90-120 minutes before your bedtime to achieve the desired results.
In the Research Section of this website you will find a whole array of credible media articles and research on the topic how blue light adversely impacts our ability to sleep and our sleep quality.
In the Sleep Section of our FAQs you can read about the importance of sleep and how lack of sleep impacts our brain and body.