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About CIRCADIAN ZircLight 

As the international leader in evidence-based circadian lighting, CIRCADIAN ZircLight provides spectrally-engineered Zirc™ branded LEDs, light engines, controls and light fixtures optimally designed to entrain circadian rhythms and prevent the disruptive effects of light exposure at night. With a world-class medical research team, Circadian ZircLight has identified and patented the specific day and night spectra which are required to optimize human circadian health and well-being. 

Extensive research over the past fifteen years has shown that the spectrum, intensity and timing of light exposure can impact human health and well-being by either maintaining or disrupting circadian rhythms. For example, not having enough daytime exposure to blue-rich light may impact one’s alertness and productivity, and impair sleep at night. On the other hand, exposure to blue-rich light at night disrupts circadian rhythms and suppresses melatonin which is associated with an increased risk of obesity, diabetes and breast and prostate cancer. CIRCADIAN ZircLight addresses these issues through its patented Zirc™ LED technology that defines the circadian spectral characteristics of light and uses this information to provide dynamic lighting solutions that foster more productive and safer work during both day and night. 

The work began in CIRCADIAN’s medical research lighting laboratory, where the CIRCADIAN ZircLight team led by Dr Martin Moore-Ede was awarded an NIH-SBIR grant to test different light-source spectra on subjects working 12-hour day and night shifts. While other research teams have researched short term exposure (up to 90 minutes) to monochromatic lights and found short wavelengths are much more potent than long wavelengths in suppressing melatonin, CIRCADIAN wanted to replicate normal workplace conditions. They studied freely moving human subjects under 540 lux polychromatic white light for 12-hour work shifts to more precisely define the circadian potent wavelengths under real world conditions

By using seven polychromatic white light sources with very different spectral power distributions and a medically relevant outcome (total overnight melatonin production, which is related to diabetes and breast cancer risk) they were able to derive a Circadian Potency curve for multiple hour white light exposure. Fortunately, they found the health problem is mostly confined to a narrow band of 440-490nm blue.

Using this Circadian Potency curve, CIRCADIAN ZircLight has created and brought to market white LED lights which maximize Circadian Potency during daytime and minimize the disruptive effect of light at night. CIRCADIAN ZircLight fixtures feature DynamicBlu™ Spectrum Control. The fixture automatically delivers blue-rich light during the day and less than 2% blue light content at night based on time-of-day, location and season. The fixtures also feature a Zirc™ NightSafe™ LED - the first LED verified by the Underwriters Laboratory (UL) to emit less than 2% blue light (440-490nm) content at night.

CIRCADIAN ZircLight is partnering with the leading lighting companies to bring the Zirc™ technology to market.

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