LHRC Releases Version 2.0 of Circadian Stimulus Calculator

LDS LHRC Calculator 400

September 21, 2021

The Light and Health Research Center (LHRC) at Mount Sinai has released an extensively revised version of its free, openaccess circadian stimulus (CS) calculator based on recent advances in the understanding of light’s effects on the human circadian system. As with earlier incarnations of the tool created when LHRC researchers were based at Rensselaer Polytechnic Institute in Troy, NY, the CS Calculator version 2.0 is designed to help lighting professionals quantify potential circadian-effective light exposures in architectural spaces.

Building on the previous tool’s capability for calculating CS levels from multiple sources and enhanced functionality for displaying results, CS Calculator version 2.0 now features:

• Addition of exposure duration, with times apportioned in 15-minute increments

• Refined accuracy of CS predictions for narrowband sources

• Availability of CIE α-opic irradiances in the output metrics

• Upload/download capability in TXT and JSON formats

• User interface improvements

• Backwards compatibility with older versions of the CS Calculator

• Bug fixes

Lighting professionals can use the CS Calculator 2.0 to compare the effectiveness of various light sources and light levels for stimulating the circadian system based on the circadian light (CLA) and CS metrics. CLA characterizes the spectral sensitivity of the circadian phototransduction circuits in the human retina and CS reflects their operating characteristics, from threshold to saturation. CS is, therefore, postulated to be a measure of the effectiveness of optical radiation incident on the retina for stimulating the master biological clock.

The CS metric was developed by LHRC from biophysical research and retinal neurophysiology, as most recently articulated in two major scholarly articles detailing the neuroanatomical and computational models of circadian phototransduction, formulated by LHRC researchers and published in Frontiers in Neuroscience. LHRC researchers have pioneered applications of the CS metric to reduce depression and agitation in persons living with dementia, improve sleep and mood in office workers, and promote entrainment in U.S. Navy submariners.

The LHRC has also developed a documentation webpage with information on how to use the calculator, the math and science behind the results, and much more.

The CS Calculator 2.0 can be found at: https://cscalc.light-health.org/

Documentation on the calculator can be found at: https://docs.light-health.org/cscalc

Source

Related Articles


Changing Scene

  • The Heart of the Olympic Park Transformed by Lemay and LumiGroup

    April 18, 2024 Architectural and design firm Lemay, and lighting agency LumiGroup, have combined their expertise to transform a partially under-exploited sector of the Montreal Olympic Park into a bright, warm, and dynamic work environment. Continuing their long-term history of working together on major projects, the mandate was to set up offices which would bring… Read More…

  • “Sustainable” Lighting: What Are Lighting Designers Asking For?

    April 16, 2024 By Sara Schonour, LC, MIES, IALD, Luxsi and Reiko Kagawa, LC, LEED AP BD+C, WELL AP, WELL Faculty Are you confused about what lighting designers are asking for regarding material transparency, and how they are defining the ambiguous term “sustainability”? 100+ specifying firms (114 and counting, to be exact) have signed the… Read More…


Design

  • Case Study: Windsor Family Credit Union (WFCU) with Salex SW

    Case Study: Windsor Family Credit Union (WFCU) with Salex SW

    February 6, 2024 Since 1940, WFCU Credit Union is a prominent and forward-thinking financial institution based in Windsor and Essex County. For over 80 years, WFCU has been dedicated to serving Ontario residents, community, organizations, small businesses, commercial entities, and public institutions. Their new headquarters in Kitchener was created as they continue to grow their… Read More…

  • Coaticook Suspended Footbridge: An Ever-Changing Luminous Canvas, Painted by Nature

    Coaticook Suspended Footbridge: An Ever-Changing Luminous Canvas, Painted by Nature

    December 5, 2023 At 170 m (554 ft) long and 50 m (160 ft) high, the Coaticook Canyon Bridge at Parc de la Gorge de Coaticook is one of the longest suspension footbridges in North America and one of the most popular tourist attractions in the Eastern Townships. For several years, the Parc de la… Read More…


New Products