Canadian Electrical Industry News Week

LRC

September 7, 2017

Lighting for healthcare presents unique challenges for accommodating the diverse populations who occupy this environment—from the physicians and nurses working dayshift or nightshift to the patients, all with varying needs, including the youngest and perhaps most vulnerable members of our population, infants in the NICU. To meet the ongoing needs of the patients, hospitals must operate 24 hours per day, 365 days per year, which places tremendous strain on the healthcare staff.

Lighting can be used to promote entrainment in various populations as well as promote alertness in healthcare staff working both at night and during the day, yet many lighting professionals are unsure of the best way to incorporate these advances in the science of lighting into their designs. To address this issue, the Lighting Research Center (LRC) at Rensselaer Polytechnic Institute has expanded its Lighting Patterns for Healthy Buildings website to include designs for the healthcare environment.

The LRC’s website provides lighting patterns, utilizing circadian stimulus (CS) as the primary design component, for three distinct healthcare environments and the needs of their respective end-users.

  • Shiftwork environment: Dayshift and nightshift workers have different lighting needs. During the day, lighting should be designed to promote circadian entrainmentLRC and maintain alertness. At night, the lighting demands are more complicated. While those working at night need to maintain alertness, disruption of the circadian clock by exposure to light at night has been associated with negative health effects. Until more research has been conducted to better understand this relationship, we recommend delivering a lighting scheme that promotes alertness without disrupting the melatonin cycle.
  • The NICU: Lighting in the NICU serves two unique populations with varying circadian requirements. Studies show that infants can benefit from receiving at least two hours of high CS in the morning to promote circadian entrainment to the solar day. Healthcare professionals, on the other hand, require light for circadian health and alertness throughout the entire shift. Balancing these different needs requires zones of light for each population to provide the proper amount, spectra and duration of light exposure at the appropriate time of day or night. 
  • Patient rooms: Lighting for patient rooms should be designed to promote circadian entrainment, providing high CS during the day and low CS in the evening, in order to increase patients’ sleep times and improve their sleep quality. Nighttime lighting should be conducive to patient sleep, while also accommodating visiting families and allowing healthcare professionals to perform their tasks.

The Lighting Patterns for Healthy Buildings website includes a section for each of these environments, providing detailed information on lighting for circadian health and alertness, as well as lighting for visual task performance.

The project is sponsored by the Light and Health Alliance, which includes Acuity Brands; Cree; Current, powered by GE; Ketra; OSRAM; Philips Lighting; and USAI Lighting.

About the Circadian Stimulus Metric 
The circadian stimulus (CS) metric is a measure of how one-hour exposure to a light source of a certain spectral power distribution (SPD) and light level stimulates the human circadian system, as measured by acute melatonin suppression. The CS metric was developed by the LRC from several lines of biophysical research, including those from basic retinal neurophysiology, has been validated in controlled experiments, and has been used successfully in numerous field applications. Unlike other proposed metrics, such as melanopic lux or melanopic content, the CS metric takes into account both the absolute and the spectral sensitivity of the circadian system, ranging from 0.1, the threshold for circadian system activation, to 0.7, response saturation. The LRC has found that exposure to a CS of 0.3 or greater at the eye, for at least one hour in the early part of the day, is effective for stimulating the circadian system and is associated with clinically relevant outcomes, such as reductions in depression and agitation among persons with Alzheimer’s disease, entrainment in U.S. Navy submariners, and improved sleep and mood in office workers. Others have also shown that a CS of 0.3 or greater is associated with better sleep in older adults.


Electrician Forum Brought to you by Schneider Electric

Schneider Electric

June 25, 2018

Sponsored by Schneider Electric

Today we are all concerned with the energy we consume within our homes. But how many truly understand the ins and outs of home energy use, and where exactly does the electrician and the development of energy management systems come into play. There is much to consider when discussing home energy use. The consumer first off needs to be informed about energy use, how it is calculated and ultimately billed if they are to make changes to their energy consumption rates. But in terms of educating consumers does the residential electrician have a role? And beyond that are manufacturers developing products designed to help electricians and consumers better understand residential energy use? Throughout this article we will deal with each of these important questions.

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Schneider

A new “future ready” circuit breaker from Schneider Electric is described by the company as the next generation of power distribution for the Internet of Things (IoT) era. Masterpact MTZ increases efficiency and can adapt to ever-evolving needs for safety, reliability and sustainability. The world is becoming more connected, electric, digitized, decarbonized, and decentralized, says Schneider Electric. Power distribution is facing new regulations, becoming more seamless and connected. 

Masterpact MTZ is the latest in a series of circuit breaker innovations, following Masterpact M, and then Masterpact NT/NW.

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Jeremy Herrington

Total Electrical Solutions was founded in 2013 by Jeremy Herrington in Quispamsis, on the outskirts of Saint John, New Brunswick. Since 2013 Jeremy has steadily grown Total Electrical Solutions in the residential, commercial and construction sectors. The growth is primarily the result of Jeremy’s customer first philosophy, plus his over 20 years of industry experience.

Jeremy grew up learning about the industry from his father who was an electrical contractor. Jeremy spent his early years helping and watching his father as a contractor and business owner. After high school Jeremy was, like many, not wholly aware of the course he wished to take and so he began an electrical apprenticeship at his father’s company.

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