Blue Light, Pupil Dilation and ProductivityDon't look back. You're not going that way. - Barbara Johnson
spc Bd 1 Bd 3
 
Share This Page

Blue Light, Pupil Dilation and Productivity

Blue light lowers productivity by causing the pupils to contract.  This is an important factor when choosing lighting for the home or office.

During the 1960's and 70's lighting experts noticed that different types of light sources, even when they had the same visual power, would result in significantly different levels of productivity. But they didn't know why. Finally, around 1990, Dr. Sam Berman and his colleagues at Lawrence Berkeley National Laboratory discovered the reason.

The strength of certain ranges of blue in the spectrum controls the dilation of the pupil. Colder lighting, or lighting with a lot of blue light, causes the pupils to contract more for a given level of light than does the same level of light of a warmer tone.

Pacific Gas and Electric has had some success using Dr. Berman's findings in an attempt to save electricity. Retrofitting entire buildings with a warmer light source, low in the critical blue spectrum, allows people to work efficiently with a lower actual level of light.

Blue Light and LED Lighting

LED's are effecient producers of light. More and more they are being used as the light source for our homes and businesses. Using LED's is somewhat complicated by the fact that all white LED's have a strong component of blue light. This blue light needs to be equalized by other light frequencies in order to create an acceptable white light source which does not lower productivity. The two common ways of creating the balancing light are to use

  • other red, yellow and green LED's that balance each other out or
  • a yellow phosphor that glows in the presence of a strong light.

 

Sources of LED lighting.

Home Facts and Fiction Resolution Color and Eyesight    Benhams Disk    Chromatic Adaptation    Chromostereopsis    Color Blindness    Color Discrimination    Color Sensitivity    Gender Differences    Metamerism    Trichromatic Theory Eye Color Peripheral Vision Blind Spot Night Vision Aging Effects Hold Time Timing

Test your Skill

Test your skill with a computer mouse by clicking as many boxes as you can in 15 seconds.

Send Us Your Comments The Site Map Link To Our Site Tell A Friend About Us Related Links Report A Broken Link Contact Information

Are you planning a cruise vacation? We have all kinds of cruises. We can book a European barge cruise, a Greek island cruise, a Panama cruise, Mediterranean cruise, Caribbean cruise, Hawaiian cruise or any kind of cruise you want.






A fun hard brain teaser logic puzzle. The Einstein puzzle.






Magnet therapy is part of good holistic medicine. Magnets can help with pain management for hip pain, heel pain, chronic pain, low back pain, upper back pain, muscle pain and many other types of pain. See us.
B7
 
Eye-Therapy.com

DISCLAIMER:

The information published here is for entertainment purposes only and is in no way intended to dispense medical opinion or advice or to be a substitute for professional medical care, be it advice, diagnosis or treatment, by a medical practitioner. If you feel ill or if you have a medical issue, you should consult a health care professional.

Site Map | Terms of Use | Privacy & Security | Contact Us | Purchase Agreement | Send Feedback
Vision and The Science of Seeing
© 1996-2005 by Eye-Therapy.com All Rights Reserved.