Canadian Electrical Industry News Week

Feb 7, 2021

LightingBy Craig DiLouie

While “circadian lighting” varies in definition, it generally refers to design that uses intensity and spectrum of light for a non-visual effect — namely, to support regulation of circadian rhythms. A new study suggests that by enabling intensity and spectral adjustment and optimizing exposure based on time of day, designers and owners can minimize the energy trade-off imposed by associated typically much higher light levels. This would entail use of an advanced lighting control system capable of scheduled dimming and perhaps spectral emission adjustment.

Circadian lighting, or biologically effective lighting, is the culmination of decades of research, though as a design practice it is new to the lighting industry. As such, it’s evolving as ongoing research is incorporated. In the meantime, the WELL Building Standard V.2, UL Design Guideline 24480, and the Collaborative for High-Performance Schools (CHPS) Core Design Criteria 3.0 all provide lighting design recommendation and goalposts for circadian lighting implementation.

In some cases, the guidelines significantly vary, either in the primary metric used or in the target values. The primary metrics used in these guidelines are equivalent melanopic flux (EML) and circadian stimulus (CS). As an example of variation in target values, at the time the study was published, the WELL Education Pilot recommended EML ≥ 125 m-lux as an appropriate stimulus four hours per day, while CHPS recommended that EML ≥ 250 m-lux was needed. As a result, it is difficult to say what “effective implementation” truly means, as again the guidelines vary and continue to evolve as new research becomes available and is incorporated.

Meanwhile, a key question in making these guidelines actionable is the potential impact on energy use, as they may pose significant increases in indoor light levels.

This was the focus of a new study by the Pacific Northwest National Laboratory (PNNL), which evaluated energy use in simulated designs attempting to comply with the guidelines. Funded by the U.S. Department of Energy, the study found significant increases in indoor light levels and associated energy consumption, suggesting an energy tradeoff in realizing circadian lighting goals.

PNNL modeled an open office and classroom, varying light output, spectral emission, light distribution, task orientation, duration of stimulus exposure, and more in a series of simulations totaling 45 unique conditions. The researchers determined that current IES task light level recommendations did not satisfy EML and CS targets for either office or classroom environments.

Lighting

“In some cases, meeting the circadian metric recommendations required an average illuminance that was more than double the IES recommendations, which may negatively affect lighting quality and increase energy use,” noted the study’s authors in their report. Satisfying circadian metric recommendations in some cases also required correlated colour temperatures (CCTs) much higher than typically used in open offices and classrooms.

Overall, PNNL estimated a 10-100%increase in annual energy use depending on the number of hours per day the circadian guideline is met. The more conservative energy estimates, closer to 10-15%, involved limiting duration of circadian stimulus to four hours per day, which would most effectively be implemented using an advanced lighting control system providing what is sometimes referred to as “light showers.”

Tunable-white offers utility for circadian stimulus but presents its own trade-offs of increased complexity and modestly higher energy consumption. Another option to reduce the required quantity of electric light is daylight, though that has its own challenges, notably variability in daylight availability.

So will lighting controls be key to unlocking the potential of circadian lighting? As again the field is evolving, this remains to be seen. The study authors noted that the energy trade-off cannot be fully expressed until circadian lighting metrics and effective stimulus delivery are better understood.

As circadian lighting may require higher indoor light levels, however, advanced controls are certainly well positioned for their ability to automatically adjust intensity and spectrum based on time of day.

As shown by this study, limiting the duration of circadian stimulus by adjusting intensity and spectrum can support circadian lighting implementations while minimizing the energy trade-off. As such, lighting controls will be considered along with other factors in future research that may be undertaken to explore the trade-off and how it can be mitigated. And lighting controls should be considered when seeking to implement current circadian lighting guidelines.

Read the study here www.energy.gov/sites/prod/files/2020/08/f77/ssl-safranek-etal-2020_EnergyBuildings_energy-impact.pdf.

Craig DiLouie, L.C., is a lighting industry journalist, analyst and marketing consultant. Learn more at ZINGinc.com http://www.zinginc.com/  and LightNOWblog.com.​

Published with the permission of Lighting Controls Association.

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www.liteline.com

 

 

 

 


 

Canadian Electrical Contractor Discussion Group: Can You Count the Deficiencies?

EIN CECD 400Have you ever been called to fix the work of a 'handyman'?

"Was supposedly done by a"certified ' electrician....told the homeowner that he got a $266 permit....no record at TSBC. Can you count the deficiencies?"

"There is a second panel change in the triplex also.......even more deficiencies. Think the guy was a glorified handyman. Ones not obvious: 240 BB heat hooked up 120....drier on 2p20....range on 2p50....water heater fed with 2c14 Bx on 2p15."

Go HERE to join the discussion

 


 

Ideal's Stay Wired to WinIt's April, which means it's time for you to ignite your competitive spark with the a new challenge from IDEAL Nationals Canada. This month, IDEAL is asking you to show off your electrical knowledge with the most correct answers.

Five professionals and five apprentice winners will each take home a $100 VISA gift card and forged wire stripper from IDEAL.

 

 

 

 

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William (Bill) BurrBy William (Bill) Burr

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Sometimes there is a gap between the initial visions of the designers and the final product. Other times, the final product and operation of the lighting systems is achieved but after much project management distress...

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11 Piece Insulated TorqueVario-S and SlimLine Blade Set• Individually tested to 10,000 volts AC and rated to 1,000 volts AC for safety and peace of mind.

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Originally announced at Autodesk University in November 2020, Autodesk Takeoff will join Autodesk Build and Autodesk BIM Collaborate as part of the Autodesk Construction Cloud unified platform. The announcement comes one month after Autodesk Build and Autodesk BIM Collaborate were made available globally for Autodesk Construction Cloud customers. 

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EIN Green 100 400

By Blake Marchand

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“It is truly an honour to be recognized by WXN and to be among this group of amazing women,” said Green of earning the distinction. “Throughout my career, I’ve worked with many great mentors and team members – to them, I say thank you for always inspiring me. I am absolutely thrilled.” Green is an industrial mechanic millwright by trade and works with Skills Ontario as Director of Competitions and Young Women’s Initiatives. 

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