Blue light from gadgets increases altertness during the day


Light plays a very vital role in human health as it influences hormone secretion, heart rate, alertness, sleep propensity, body temperature, and gene expression. The perception of light includes glare and brightness which are functions of wavelength. The short wavelength of blue light makes it the most energy efficient light for humans as it is perceived as the brightest. We are surrounded by Blue light which is said to be  subtle and dramatic. 

Advantages of blue light

Several studies have shown beneficial effects of blue light in day time –

  • It is superior to other wavelengths in enhancing responses in the left frontal and parietal cortices during a working memory task
  • It leads to quicker auditory reaction times and fewer lapses of attention compared to green
  • Blue wavelengths suppress sleep-associated delta brainwaves and boost the alpha wavelengths, which are related to alertness
  • Blue light is more powerful in elevating body temperature and heart rate and in reducing sleepiness compared to green light

Increasing blue portion of artificial light  in daytime may improve performance and learning ability in school kids and employees working indoors, and health will be improved in patients staying at nursing homes or hospitals.



Author: drpoojachhawcharia

Dr Pooja Chhawcharia is the Senior Nutritionist at eKincare with over 7 years of experience in Nutrition education, diet counseling and research. She is a Registered Dietician with the Indian Dietetic Association and Certified Diabetes Educator recognized by the International Diabetes federation . She is also interested in ancillary sciences such as Yoga and Naturopathy.

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