Is All Blue Light Bad?

Posted on Mar 3, 2018 in Health

There’s been a lot of recent discussion surrounding Blue Light, the light emitted from our digital screens. Everything from our cell phones to our computer screens, tablets, TVs, and even the LED lighting in our homes emits this type of high-energy light. Blue Light is the highest energy light that can be seen by the human eye, and high amounts of unnatural exposure to it may have unintended effects.

Blue Light isn’t all bad, though. Human bodies have evolved to utilize radiation from the sun in many ways. For example, we know that UV light helps our bodies make vitamin D when the radiation hits the skin. Similarly, Blue Light sends critical signals to the brain about the presence of Blue Light which help to regulate the circadian rhythm and other internal processes. Because the most abundant source of light is the Sun, the retinas of the human eye register Blue Light as daylight. In the absence of Blue Light the brain signals the pineal gland to produce melatonin, which is essential for sleep. When we are bombarded with the high energy light of our digital devices after sunset it tricks our body into thinking it is still daylight; disrupting sleep. Conversely, if we were to totally eliminate all Blue Light during the middle of the day our bodies would think it was night and wind down for sleep. Additionally, many people suffer from Seasonal Affective Disorder, a depression during the winter when there is less sunlight, which can be treated with Blue Light therapy.

Ultimately Blue Light is a totally natural thing that is neither good nor bad, but rather it is our unnatural exposure to it that is doing harm. Overexposure to Blue Light can cause digital eye strain, lost productivity, and poor sleep. Rather than going on a vendetta against Blue Light, however, consider adopting some best practices and investing in technologies that allow you to manipulate Blue Light to mimic the sun cycle.


  • This startup is producing Blue Light filtering glasses with three, high tech, scientifically calibrated filtering spectrums customized to your needs whether it be casual screen use, total digital addiction, or total elimination of Blue Light for sleep.
  • Invest in a Blue Light therapy box. Setting this by your desk during winter months could ward off depression.
  • Changing the lighting in your bedroom and bathroom to emit no blue light can assist in more natural sleep preparation. Purchase low blue light bulbs that are designed to mimic the wavelengths emitted by the sunset.