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Lighting Design for Health Effects

Jan 15, 2018

The Lighting Research Center has released a new version of its Circadian Stimulus Calculator, a free tool designed to help lighting professionals choose light sources and levels ideal for circadian stimulus. The lighting professional establishes the base condition using the CS calculator and software such as AGi32. Various lighting strategies are then considered, which can be fine-tuned to achieve the right balance between circadian stimulus, IES recommendations, energy codes and owner requirements.

CLCalculatorBiological rhythms that repeat approximately every 24 hours are called circadian rhythms. Light is the main stimulus that helps the circadian clock, and thus circadian rhythms, keep a synchronized rhythm with the 24-hour day. If lack of synchrony or circadian disruption occurs, we may experience decrements in physiological functions, neurobehavioral performance, and sleep.

Lighting characteristics that are effective to the circadian system are different than those effective to the visual system. In order to apply light to mitigate symptoms of Alzheimer's disease, depression, jet lag, or sleep deprivation, we need a better understanding of the quantity, spectrum, timing, duration, and distribution of light that is effective for the circadian system.

About the Circadian stimulus calculator

» Read December 2017 article in ELECTRICAL CONTRACTOR magazine to learn more about benefits of Circadian Lighting practices and what it means for electrical contractors.

» Download the CS calculator.  Download the CS tool at http://bit.ly/2lD5X8G.

The new calculator provides additional functions not included in the original version, including the ability to calculate CS levels in rooms with multiple light sources, and combine pre-loaded SPDs from the calculator dropdown and user-supplied SPDs to provide one CS measurement and a single relative SPD.