Five key discoveries that have revolutionized the medical science of lighting

The Darker Side of Light

The scientific evidence for the health risks from blue light at night. Click on links below to download publications:

Optimizing Light for Human Health and Performance

floorPlanLocated on Boston’s Rt 128 High Tech Corridor

Dr Martin Moore-Ede, a former professor at Harvard Medical School, and his biomedical engineering research team built this medical research center to identify and develop the optimal lighting for 24/7 operations. With funding from the National Institutes of Health and other supporters they designed and operated light-controlled medical research center with fully spectrally-controlled workplace and residential lighting, to study human volunteers living and working shifts around the clock. 

As lighting with carefully controlled spectral content is delivered, a full range of physiological, psychological performance and medical tests are undertaken including

  • Sleep and wakefulness with continuous EEG monitoring
  • Blood tests (lipids, cardiac markers)
  • Glucose Tolerance tests (Diabetes)
  • 24-hour urine melatonin collection
  • Salivary Melatonin 30-minute intervals
  • Blood pressure
  • Alertness & performance tests
  • Mood and Depression scale test
Full ethical protection of our volunteers is provided. Each participant gave written informed consent after receiving a full explanation of the study purpose, design, and procedures. Study protocols and consent forms are reviewed and approved by the Circadian Institutional Review Board (IRB# 00001522) registered for Federal Wide Assurance (FWA) with the Office for Human Research Protections (OHRP) of the Department of Health and Human Services (HHS).  

  • Identification of narrow band of 440-490nm blue light which disrupts circadian clocks at night, and elucidation of the light-adapted circadian spectral sensitivity curve.
  • Development of spectrally-engineered white light LEDs which remove critical blue wavelengths without causing yellow light.
  • Testing of multiple light fixtures to determine which best optimize human health markers such as insulin resistance, melatonin levels and sleep
  • Demonstration that blue depleted white light at workplace illumination levels can prevent the circadian disruption, melatonin suppression, excessive hunger and reduced vigilance caused by conventional blue-pump LEDs.
  • Development and testing of control systems which track the natural sunrise and sunset across the seasons of the year, and keep interior lighting in-sync with the external environment


Lighting Innovations Driven By Medical Science

The Circadian Light Center serves as our medical research facilities for developing lighting technology. It is here, in our own in-house 24/7 workplace simulation center, that we set out to define the exact wavelengths of the light spectrum that would be healthy for people during the day, and those wavelengths that would be healthiest to see at night.

The Health Problem with LEDs

Most LED and fluorescent lights on the market today increase obesity, diabetes, heart disease risks, and reproductive problems and cause up to a 50-65% higher rate of breast cancer, prostate cancer, and gastrointestinal cancer when used in the late evening or at night.

Mounting medical evidence shows they provide too much Bio-Active Blue during the night, and too little during the day, leading to circadian rhythm disruption, mood and health disorders and low productivity. This serious health problem is now recognized by the World Health Organization (WHO), American Medical Association (AMA) and the National Institutes of Health (NIH).

The CIRCADIAN Light Solution

CIRCADIAN LED Lights deliver high quality white light with 24/7 control of the Bio-Active Blue levels to boost alertness, productivity, and health and prevent circadian rhythm disruption. CIRCADIAN Light fixtures are autonomous, easily installed by any electrician and provide high quality white light with the optimal bio-active blue levels based on time of day, season, and location.

Our Products

CIRCADIAN Light fixtures are designed to provide quality white light 24/7 with the precise wavelength spectrum day and night to optimize health and performance. They deliver the “24-Hour Spectrum of Health”


Within each fixture are intelligent control boards pre-programmed for the life of the fixture providing the correct Bio-Active Blue light regulation for the accurate time of day, season, leap years, and geographic location for optimized circadian effectiveness. These controls provide continuous white light with a smooth, imperceptible transition from Day to Night mode.

  • Lumen output maintained over each 24-hour period and meeting specific industry work space illumination standards with 3000-4000K CCT and >80 CRI. The lights can be dimmed during all phases.
  • Light spectrum optimized for peak productivity, mood, and energy to reduce fatigue and errors, by using extensive human subject testing in 24/7 simulations of 12-hour day and night shifts in the CIRCADIAN Light Medical Research Center.
  • Removes over 90% of harmful Bio-Active Blue emitted by conventional LED lights that causes the circadian disruption that has been identified by WHO, AMA, and NIH to increase the risk of obesity, diabetes, heart attacks, depression, breast cancer, prostate cancer, and gastrointestinal cancers.

CIRCADIAN Lights: The Only Effective Solutions

The growing awareness of Bio-Active Blue light nocturnal exposure health risks has led several companies to try to capitalize on the market opportunity by rushing to market with so-called “circadian lighting” products that do not prevent the circadian disruption by light at night. Below are the features of conventional LED, fluorescent lights and other new lighting products in comparison to the authentic CIRCADIAN Light solution.


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