Harvard University Selects Low-Intensity
GreenLIGHT Lamps for NASA Study




The Lo-LIGHT in the Russian Institute for Biomedical Problems 
chamber in a simulated space travel project.

Harvard University selected Sunnex Biotechnologies Lo-LIGHT lamps to evaluate lighting interventions for combatting the negative effects of sleep disturbance in astronauts in a NSBRI study. The study was conducted in collaboration with the European Space Agency at the Russian Institute for Biomedical Problems. (see More)

* NSBRI - National Space Biomedical Research Institute


The study compared the effects of the Lo-LIGHT using the GreenLIGHT technology with other types of light on performance, alertness, and mood during the night shift.

MORE about An Operational Evaluation of a Photic Countermeasure to Improve Alertness, Performance, and Mood During Night-Shift Work

The Lighting Intervention Study, with lead investigator Dr. Charles A. Czeisler, Director of the Department of Sleep Medicine at Harvard University, compared the effects of different wavelengths of light on performance, alertness, and mood during the night shift. The trials consisted of two different wavelengths of light in the green spectrum, a shorter wavelength green light [the Sunnex Biotechnologies GreenLIGHT], and a medium wavelength green light(545-555 nm), as well as a control condition with longer wavelength (620 -690 nm) red light. Crew members and mission control personnel participated.

Studies to Improve Performance and Alertness of Night Shift Workers for NASA

The Lo-LIGHT in the Russian Institute for Biomedical Problems 
chamber for a simulated space travel project.

From their examination of human sensitivity to visible light wavelengths, Harvard found "new information about the peak sensitivity of the human circadian system, determining that the most efficacious specialized light source should have a peak near 500nm (as opposed to ~470nm as the lamps produced by Philips Lighting, Eindhoven, Netherlands, as originally proposed), and therefore identifying such a new specialized light source for our studies; retrofitting our laboratory with specialized lamps (manufactured by Sunnex Biotechnologies, Winnipeg, MB, Canada) with a peak sensitivity near 500nm."

[From NASA's Space Life & Physical Sciences Research & Applications Division Task Book - Evaluation of Photic Countermeasures for Circadian Entrainment of Neurobehavioral Performance and Sleep-Wake Regulation Before and During Spaceflight.]

General Applications

Low-intensity GreenLIGHT technology has application for shiftworkers, jet travelers and any personnel who need to shift the timing of their biological rhythms. It can be adapted safely and comfortably into almost any work environment. Potential users include first responders, hospital staff, air traffic controllers, power plant operators, people in the transportation industry and on military operations.

See Summary of green Light study to improve alertness, performance, and mood during the night shift. in the Technical Section and Earth Applications tabs.
More applications of the GreenLIGHT system in the workplace for night shift counter-fatigue programs.


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The Sunnex Biotechnologies Lo-LIGHT phototherapy lamp comes with a five year warranty. Details