LED Luminaire


Circadian ZircLight, Inc.

Verify ID:


Expiration date:

April 13, 2018 - April 12, 2021

Verification Mark

Product Information

CIRCADIAN DynamicBlu™ LED Lighting Products with NightSafe™ Technology provide less than 2% blue content at night (between sunset and sunrise), and blue-rich light during daytime hours. The percent blue content is calculated as the irradiance in the 440-490nm blue wavelength fraction expressed as a percentage of total visible light (380-780 nm) irradiance.
CIRCADIAN Light’s products not only provide the efficacy and reliability expected of white LED lighting but also are spectrally engineered to provide the optimal blue content by time of day, season and location. To learn more about our products, visit our website at https://circadianlight.com/
UL Verified, UL 1598 Listed, and FCC and RoHS compliant: First LED lighting products UL Verified less than 2% Blue Content at night.

* This information was provided by Circadian ZircLight, Inc. and may contain additional information outside the scope of this Claim Verification.

Applicable To:

CSPT/CSM Series 1’x4’, 2’x2’ and 2’x4’

Marketing Claim Verified by UL

Less than 2% blue light content at night

Verification Method

In accordance with LM- 79-08, Section 9.1, measure the radiation emitted by the product across the visible spectrum of 380 – 780 nm. From the visible spectrum radiation measurement, determine the amount of “blue light” radiation emitted between 440-490 nm. To calculate the percent of blue light emitted, divide the amount of blue light radiation by the amount of radiation measured across the complete visible spectrum.

About the Manufacturer

ABOUT CIRCADIAN® Light CIRCADIAN Light is a member of the worldwide CIRCADIAN® group of companies, bringing health, productivity and safety solutions to 24/7 business workplaces around the globe. Born out of breakthrough research on human circadian clocks at Harvard Medical School, CIRCADIAN over the past 30 years has led in the transition of medical science breakthroughs into the workplaces of over 50% of the Fortune 500 companies. Based on its unique understanding of workplace health and safety risks, and its leadership in circadian science, CIRCADIAN® Light developed and tested in our Medical Research Center the optimal lighting solution for people working day and night shifts. Headquartered on Route 128, Boston's Technology Corridor, CIRCADIAN serves the 24/7 world, operating out of offices in North America, South America, Europe, Asia and Australia. Our mission is to make workplaces healthy, safe and productive for the 90 million people in critical jobs who work night and day shifts to give us our seamless 24-hour society.

What is UL Verification?

UL Verification is an objective, science-based assessment that confirms the accuracy of marketing claims. Our independent assessment process scrutinizes the validity of specific advertising or promotional statements, giving you a way to separate verified fact from fiction.