Is Blue Light Good?

…or a disruptive force in the modern world?

Unbalanced light spectrums are an entirely new reality for human biology. Can our bodies cope?

Blue light can affect:
  • sleep
  • hormones
  • brain chemistry
  • skin
  • digestion
  • eyes

This new reality is here to stay! Blue light is energy-efficient, it keeps us alert, and boosts dopamine — for a while.

Unfortunately, it does a whole lot more than that, though. And getting blue light at the wrong time can have some pretty devastating consequences for your overall health.

Especially if you’re trying to improve your health.

Interested in making the most of your blue light environment?

Here’s how.


Throughout human history, the sun was the only source of blue light in the entire solar system.  

After sundown, blue light was gone until sunrise.

Our brains still use this natural light cycle to perpetually train our circadian rhythm.

Blue Light is Everywhere

Modern screens & lights are blue-rich.

Fluorescents, LEDs, Screens

Modern light bulbs were invented to save on energy costs and to help the environment.

Unfortunately, any energy savings are achieved by removing healthy infraRED from the bulbs — and increasing blue output.

Fluorescent Bulb Spectral Output

LEDs are often even worse about this than fluorescents.

Even bulbs labeled “warm” create highly unbalanced light — with very little infrared.


Unbalanced Blue Light

Can Be Harmful

To avoid the harmful effects, blue must be balanced, primarily, by red.

Cytochrome c oxidase

An important enzyme in cellular metabolism (responsible for converting oxygen into water in the cell), cytochrome c oxidase is interrupted by toxins in the environment, as well as unbalanced blue light.

“Cytochrome c oxidase is one of the enzymes damaged by stress and by blue light, and activated or restored by red light.”

Ray Peat, PhD

Eye Damage

Is -UV- the primary risk for light-induced eye damage? Or is it a different light frequency?

Consider this: Daily UV levels are nearly absent for most of the year in temperate climates. In fall, winter, and spring, UV levels hardly reach even moderate levels throughout temperate zones for nearly the entire day.

Further, even in summer, UV levels are quite low for several hours in the morning and evening.

What’s more — as we’ve discussed in the Why Light? page — humans are indoors 99% of the day.

Yet, the myopia epidemic/pandemic is worsening globally, and there’s even robust evidence that what’s behind this is a lack of full-spectrum natural sunlight. In this line of thought, full-spectrum light — which includes UV — is necessary for health of the eye.

Perhaps there’s another threat to the eye, something very similar to UV light, but one that’s present all day and into the night — inside our homes:

Modern eyes are bombarded with high-energy blue light all day, every day.

Unbalance blue light — and a lack of full-spectrum light — appear to be behind the global myopia pandemic.
STUDY: “Harmful blue light-induced effects on human eyes should not be ignored.

“It’s no secret that blue light harms our vision by damaging the eye’s retina,” says chemist and senior researcher Ajith Karunarathne.

Researchers found that the detrimental effect to the eye did not happen when blue light was mixed with other colors of light.

Unbalanced light matters a great deal to health.

Blue Light Affects Brain Chemicals

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