Page 42 - Lighting Magazine April 2020

The Rise of “No-Blue”
Lighting
As the link between light and health grows, so has the understanding that CCT and CRI are not adequate to characterize circadian lighting, neither during daytime nor at night.
BY DAVID SHILLER
Arecent report from Marketsand- Markets projects that the global “Humancentric Lighting Market” will grow from $810 million in 2019 to $3.7 billion by 2024. This is more
than a 4-fold increase over the next 5 years, and a compound annual growth rate (CAGR) of 35.2 percent. There was a time when circadian lighting
literature discussed using a cool CCT during the day and warm CCT at night. That’s no longer the case. With a growing understanding of the “rela- tive circadian spectral sensitivity curve,” it’s now understood that it’s possible to have cool CCTs with poor circadian stimulus and warm CCTs with too much circadian stimulus. Specific areas of the blue spectrum need to be “enriched” during the
40 enLIGHTenment Magazine | april 2020
www.enlightenmentmag.com