More than 20 years of scientific research reveal that exposure to blue-rich light in the evening and at night increases the risk for certain types of cancers.

The subject was further explored in 2007 by the International Agency for Research on Cancer (IARC) and the World Health Organization (WHO), which revealed that shift work that impacts natural circadian rhythms is “probably carcinogenic to humans.”

Further exploration of the 2007 findings revealed: 

  • Breast cancer increased 32% - 58% in women regularly exposed to light at night.
  • Prostate cancer increased up to 200% in men regularly exposed to light at night.
  • Blind women have a lower risk of breast cancer, and blind men have a lower risk of prostate cancer that is related to the degree of visual impairment.

CIRCADIAN Light LED Breakthrough Verified by UL: White Light with Less than 2% Blue Content at Night 

STONEHAM, MA -----   The significant health risks linked to the use of LED lights at night may have finally been solved by an innovative new LED technology. CIRCADIAN® Light’s new Night-Safe™ LEDs are the first lights verified by UL, the leading global safety certification company, to emit white light with less than 2% blue content at night. This medically-significant breakthrough addresses the growing scientific evidence that exposure at night to the 10 - 30% blue light content of conventional LEDs has a profound negative effect on many aspects of human health and performance.

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More than 15 years of scientific research show that exposure to blue-rich light in the evening and at night increases the risk for cardiovascular disease by as much as 40 percent for night shift workers.

Most energy efficient LEDs in the market today are rich in the blue wavelengths that at night trigger the metabolic processes involved in hypertension, atherosclerosis, and cardiovascular disease through:

1.) Disruption of the circadian system (phase shifting and circadian misalignment)
2.) Melatonin-suppression and phase shifting

Make Lighting Healthier

Artificial illumination can stop us sleeping and make us ill. We need fresh strategies and technologies, argues Karolina M. Zielinska-Dabkowska.

Groundbreaking Evidence Shows Light at Night Increases Risk of Obesity and Diabetes

While it might make sense to turn up the Kelvin settings during the day and down toward night, it's not always that simple. MARK HALPER discovers the virtues of spectral power and natural light at offices from coast to coast in the US.

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