HUMAN CENTRIC LIGHTING
FOR CIRCADIAN REGULATION
HOW TO QUANTIFY CIRCADIAN STRENGTH
Much like the ear which controls both hearing and balance, the eye has dual functions as well. Not only does it enable vision, but also synchronizes our biological clock to the world. Our biological clock dictates when we wake, sleep, eat and achieve different levels of performance. And since this secondary function does not contribute to vision, typical metrics such as lumens and color temperature are not appropriate for determining circadian strength.
Since the traditional metrics do not work, two new models have been developed to determine the circadian effectiveness of a particular spectrum of light. The first is the equivalent melanopic lux (EML) ratio which was adopted by the WELL Building Standard. The second is the Circadian Stimulus (CS) calculator which was developed by the Lighting Research Center (LRC). Each model is designed to provide the proper support and definition of circadian health, which according to both models, is achieved, by providing high circadian stimulus during the day to prevent circadian drift that can lead to social jet lag. You can find the latest format of each model on the BIOS Website.
The EML ratio is a multiplying factor (similar to S/P ratio or Ballast Factor) applied to the typical photometrics (i.e. lumens, foot-candles or lux) to convert them into circadian stimulus metrics (i.e. melanopic lux). The WELL Building Standard’s circadian requirement mandates one of two elements be met. Either show all workstations provide maintained illuminance on the vertical plane of equivalent melanopic lux greater than or equal to the vertical lux recommended by American National Standard Practice for Office Lighting (ANSI/ IES RP-1-12) or show at least 250 equivalent melanopic lux (including daylight) is present at 75% or more workstations on the vertical plane, measured forward for at least 4 hours per day.
The circadian stimulus calculator takes into account the rod and cone contribution to circadian system, with a main point of difference of the subadditivity known to exist in traditional color vision. These contributions depend on the amount of light, and thus require active use of the CS calculator in the lighting design process. The threshold for providing a proper daytime circadian stimulus is 0.3.
The ALPHABET Downlights Biological Series featuring BIOS® SkyBlueTM technology is redefining Circadian Rhythm LED by providing high melanopic lux (EML) in a full range of color temperatures.
- Patented SkyBlueTM technology provides the spectrum required for circadian regulation and entrainment
- Ideal spectrum for daytime light exposure without sacrificing desired color temperature
Full CCT offering in 3000K, 3500K, 4000K, and 5000K
- Color Rendering between 85 and 90 (CCT dependent)
Each light engine is calibrated for consistent color point
- Fills the “green gap” from traditional LED lighting
- Spectral output designed to offer maximum protection from dangerous “Blue Light Hazard”
- Contributes towards satisfying WELL BUILDING STANDARD circadian lighting specs
Daylight versus melanopsin and blue light hazard
SPD of LEDs versus melanopsin and blue light hazard
WHAT DOES BIOS® SERIES FOR CIRCARDIAN REGULATION DO?
Circadian Rhythm is the human body clock that operates critical functions including the production of testosterone, growth hormone, cortisol, and melatonin. These hormones have a direct influence on a body’s overall health and functionality in key areas including:
LIGHT IS THE STRONGEST TIME CUE FOR THE CIRCADIAN SYSTEM
Light signals the body clock whether it is night or day and therefore if it should be awake, alert, restful or regenerative. Photobiologists discovered a light-sensitive protein in the eye’s retina called Melanopsin that detects intensity or changing levels of light. This photoreceptor projects to a different, non-visual part of the brain where our circadian clock is located. So when sunlight gets brighter in the morning, melanopsin becomes very active and triggers the brain’s body clock, or suprachiasmatic nucleus, to shift into an active day pattern.
BIOLOGICAL LIGHTING FEATURING BIOS®
BIOS® SkyBlue technology is spectrally optimized to peak at the newly found circadian photoreceptor’s peak sensitivity, while providing minimal blue light hazard from 420nm-470nm, known to accelerate the onset of macular degeneration. This combination provides the ideal solution for daytime use to help combat social jet lag plaguing 87% of dayshift workers.
HEALTHY LIGHTING WITH SKYBLUE™ TECHNOLOGY
There are several negative impacts endemic with electric light. It disrupts our body’s natural rhythms and alters our relationship with natural light. It changes what millions of years of evolution entrained in our bodies and contributes to numerous health issues. Unfortunately, an average of 90% of our time is spent indoors under electric light. Electric light does a poor job mimicking the sun. It makes our days dimmer, our nights brighter, and our Biological system confused. Our bodies were designed to sync up to the one true constant in life, the sun. Fortunately, new indoor lighting from BIOS can now get people back on track with their circadian clocks. In 2016, BIOS Lighting revolutionized lighting with the introduction of BIOS SkyBlue™ LED technology. SkyBlue infuses natural blue sky spectrum into LED light to create lighting that is even healthier than the sun making it ideal for use in:
- Senior Living Facilities
- Sports & Fitness Facilities
- Office Interiors
- Schools & Colleges
- Manufacturing & Mining Operations
- Aviation & Space Applications
- Military & Defense Applications
- Government & Community Venues
SPD of BIOS versus melanopsin and blue light hazard
REQUIREMENTS FOR LRC CIRCADIAN STIMULUS (CS) CALCULATOR
- Measurement Location At the eye (vertical)
- Intensity (minimum) 0.3 CS (Note: 185 lux w/ BIOS @ 3500K)
- Duration (minimum) 1 hour
- Timing (minimum) Early part of the day
REQUIREMENTS FOR CIRCADIAN LIGHTING DESIGN PORTION OF THE WELL BUILDING STANDARD V1 (54-A)*:
- Measurement Location 4' AFF @workstation, pointing outward (vertical)
- Intensity (minimum) 250 melanopic lux, including daylight
(Note: 267 lux w/ BIOS® @ 4000K
- Duration (minimum) 75%
- Timing (minimum) During the daytime
REQUIREMENTS FOR CIRCADIAN LIGHTING DESIGN PORTION OF THE WELL BUILDING STANDARD V1 (54-B)*:
- Measurement Location Per IES-ANSI RP-1-12
- Intensity (minimum) Equivalent melanopic lux greater than or equal to (Ev) Targets
for the 25-65 Category of Table B1
- Coverage 100%
- Duration (minimum) All day
- Timing (minimum) Early part of the day