The effects of Blue Light


So firstly let me explain what exactly Blue Light is for some of you that may not know.

Blue light is a colour in the “visible light spectrum” that can be seen by the human eye.

Blue light can actually be found anywhere as it’s found in the sun, electronic devices such as laptops, TV’s, mobile phones & tablets. It’s also found in LED or fluorescent lighting. It’s actually what causes the sky to look blue.

So to be honest it’s quite hard to avoid on a daily basis.

In its natural form, your body uses blue light from the sun to regulate your natural sleep and wake cycles. This is known as your circadian rhythm. Blue light actually helps boost alertness & also elevate moods.


So why should we be concerned about blue light exposure?

Most of today’s electronic devices will consist of an LED screen which emits a strong blue light wave. With they increasing amount of time that we now spend on these devices we are being exposed to a lot of artificial blue light.

Chronic exposure to this light can have many negative effects. At night it can lower the production of melatonin.  This is hormone that regulates sleep so in return can disrupt your circadian rhythm.

Blue light waves have a very short wavelength which causes a flicker. This flickering is believed to be the cause of eyestrain’s, headaches, physical and mental fatigue after many hours sitting in front of a computer screen.

How can I help eliminate these negative effects?

  • Limit screen time – consider spending less time in front of your computer screen on a daily basis.
  • Adjust your screen settings – most devices will have a function to adjust the brightness. iPhones now have a night mode option which I highly recommend using. Also download f.lux app to your PC or laptop. This adjusts the colour of your screen based on the time of the day.
  • Blink more often – remind yourself to blink often to avoid dry eyes.
  • Avoid before bed time – blue light should be eliminated from your environment at least 1 hour before you sleep so it does’t effect your sleep pattern.

So overall Blue Light has both positive & negative effects. It’s best in natural form and try avoid it for long periods of time through artificial sources.

This may be a huge cause of keeping you awake at night time so turn off that TV, put away your phone and get yourself some good sleep.

Gavin 🙂