The 5 Most Harmful Sources of Blue Light (and how to avoid exposure)

When it enters the human eye, blue light stimulates the hypothalamus, which is a region of the brain that controls many aspects of the body’s self-regulation including temperature, hunger, and circadian rhythms.
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Blue light is a naturally-occurring part of full-spectrum sunlight with range from 450 to 500 nanometers (nm). However it’s also isolated and used to illuminate our screens and also light bulbs. Fabricated blue light is extremely bright, and that can have unfavorable results on sleep and eyes if you take in too much. So where does all that blue light originated from? In this article, we’ll break down the most usual sources of blue light direct exposure on which we can influence. We’ll also describe a few of the health effects of blue light, and recommend methods to lower dangerous blue light exposure.

Sources of blue light include the sun, digital screens (TVs, computers, laptops, smart phones and tablets), electronic devices, and fluorescent and LED lighting. Well the first one, which is sun, includes full-spectrum of wavelengths and actually with combination of other colors and wavelengths in natural sunlight, it doesn’t pose the same risks as when bright blue light is isolated for technological purposes. That’s why we are going to have more focus on isolated examples of blue light.


What gets on television every night? Blue light! Practically every tv makes use of extremely brilliant blue light to light up the screen and bring the image to life. [2] The longer you watch TV, a lot more you’re indulging in artificial blue light. Like artificial illumination, this is mostly an issue at night, when your mind and body are unwinding to sleep. Taking in excessive TV light can interfere with your sleep and also circadian rhythm. [2] It can likewise result in eye stress and also frustrations. [1]

What Can You Do? The best method to prevent the drawbacks of TV light is to turn it off at least two or three hours before bed. Offer your body time to transition into rest without all heaven light in your face. It’s likewise best to restrict the late night TV binging. Try to listen some relax music or try to find some great books. Reviewing has actually been discovered to lower high blood pressure, reduced heart price, and minimize stress and anxiety.

Smartphones and Tablets

Smartphones and also tablets are tiny computers, and also they have the exact same blue-lit displays that beam brilliant light at us at any moment of day. We use them at all times, yet checking out your phone for as well long during the night can undermine your rest.

Smartphones and tablets can be a larger blue light danger than Television and computer systems just due to the fact that there’s less distance between our eyes and the screen. Less distance means less light diffusion, so we’re taking in a more focused blast of blue light whenever we read a message or inspect an application.

What Can You Do? Like computer systems, there are apps and filters to reduced color temperature and block blue light. Setting personal limits for display time can aid, like trying not to utilize your phone in bed during the night. Some people also like blue obstructing glasses that filter blue light from screens and also fabricated lighting. The key is to prevent looking at your phone in the hour or two before you attempt to go to the bed. And also if you’re having difficulties with resting, rolling over and also taking a look at your brilliant phone is a guaranteed means to remain awake.

Negative impacts

When it enters the human eye, blue light stimulates the hypothalamus, which is a region of the brain that controls many aspects of the body’s self-regulation including temperature, hunger, and circadian rhythms. The biological clock regulates daily activities like sleeping and eating patterns, because it disrupts the production of melatonin – a hormone that helps you fall asleep. This can lead to problems with moods and energy levels throughout the day. There are also evidence that exposure to blue-rich light in the evening and at night increases the risk of obesity and diabetes, with that we mean effects on your blood sugar levels. In addition, blue light has been linked with anxiety, depression, and other mental health problems. Studies have even shown that it can also damage cells in your heart and brain.

How to reduce exposure?

In our daily activities, we cannot afford to ourselves to be out of our most usable stuff where we primarily receive blue light. So it is inescapable, however, you can still restrict your exposure.

You will most likely utilize phones, computers, TVs, and man-made lighting. They all bring a lot of bright blue light into your life. However, if you use them much less at night as well as even before bed, you can decrease the negative effects on your sleep as well as circadian rhythm. Obtaining outdoors throughout the day and getting all-natural, full-spectrum light is hugely favorable for your health & sleep and combats a few of the effects of excess blue light.

You can also check the Harvard medical study where their state is that “High Energy Visible (HEV) blue light has been identified for years as the most dangerous light for the retina.  After chronic exposure, one can expect to see long range growth in the number of macular degenerations, glaucomas, and retinal degenerative diseases”.  And a paper published by the American Macular Degeneration Foundation (AMDF) reports that “the blue rays of the spectrum seem to accelerate age-related macular degeneration (AMD) more than any other rays in the spectrum”.

[1] Dan Roberts. Artificial Lighting and the Blue Light Hazard (The Facts About Lighting and Vision). 

[2] Harvard Health. Blue light has a dark side.

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