Recessed 2X2 LED Troffer design offers healthy, white light without the harmful blue light.

Recessed 2X4 LED Troffer design offers healthy, white light without the harmful blue light.

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


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