The Science of the Low-Intensity Lo-LIGHT Lamp

In the early 1990s researchers at Sunnex Biotechnologies proposed that the wavelength or color of the light was as important as the intensity for light therapy to be effective. After testing different colors, it was determined that the intensity of light used for light therapy could be reduced by over 90% by selecting the visible light wavelengths provided by the GreenLIGHT technology - wavelengths between 500 and 505 nm.

The technology used in Lo-LIGHT lamps was first presented at a scientific conference, the annual meeting of the Society for Light Treatment and Biological Rhythms, by Dr. A.J. Lewy, the originator of "bright light" therapy. He showed that low intensity GreenLIGHT was as effective as high intensity "bright" white light in shifting human circadian physiology. Since then, several studies by leading authorities in light therapy have confirmed this.

visible light spectrum

NOTE: The wavelengths of GreenLIGHT emitted by Lo-LIGHT lamps peak at 500 nm to 505nm.



Confirmed by leading researchers of light therapy

Lo-LIGHT lamps were determined to be the "best phototherapeutic device" for regulating circadian rhythms to alleviate the negative effects of night shift work and jet lag, in studies conducted by the U.S. Air Force and Defence Research and Development Canada (DRDC). The senior author of the study, Jo Arendt, a leading authority and pioneer in light therapy research, was principal investigator of the first published studies on spectral sensitivity of human circadian rhythms in 2001.
See Ref

After determining that Lo-LIGHT lamps are the optimal light source for regulating human circadian rhythms, Harvard's Department of Sleep Medicine selected them to use in studies for NASA and the European Space Agency on extended space travel. MORE on National Space Biomedical Research Institute project for NASA and the European Space Agency



Effective for major depression and bipolar depression

Low-intensity Lo-LIGHT therapy lamps have been found to be highly effective in clinical studies on the treatment of non-seasonal major depression and bipolar depression, as well as for SAD (Seasonal Affective Disorder). 300 lux of GreenLIGHT from a Lo-LIGHT lamp has the same effect as 10,000 lux of white light from a bright light therapy lamp for regulating human circadian rhythms as well as for treating mood disorders. MORE

Low-intensity Lo-LIGHT lamps do not emit blue light wavelengths and cannot harm the retina or contribute to the development of AMD, which is a concern with 'bright light' or 'blue light' therapy lamps.
Light therapy and retinal damage


GreenLIGHT vs Blue Light

Studies demonstrating the effectiveness of the low-intensity GreenLIGHT technology stand in stark contrast to studies that find increasing the proportion of blue light is of no benefit for light therapy.
The advantages of GreenLIGHT over blue light therapy

A major study confirming the lack of superiority of blue light wavelengths in light therapy was published by Science. The reason this study is so significant is because several authors of this study were the researchers whose earlier studies led to the widespread misconception that blue light would be more effective than white light for light therapy.
More on Harvard study confirming lack of benefit of blue light for light therapy.



Purchase or "No Risk" Rental Plans

In North America, a no-risk rental program is available on some models. If the unit is purchased within 2 months from the time of rental, all rental payments are applied towards the purchase price. Order Now!

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