Canadian Electrical Industry News Week

July 16, 2018

Lighting 1Specular reflection, also known as veiling reflection, is light reflection from an object or task that obscures details. It is a vital concept in the field of lighting.

A beam of light that comes to rest on a surface may be reflected in several ways. The beam alters its course once it hits certain types of surfaces. There are many types of light reflection, but specular reflection is the occurrence that needs to be taken into consideration when designing a lighting arrangement for a given space.

What is specular reflection?

Specular reflection is a type of surface reflectance often described as a mirror-like reflection of light from the surface. In specular reflection, the incident light is reflected into a single outgoing direction.

Light reflects on a surface known as specular surface (similar to that of a mirror) at the angle of incidence; it is further reflected at a similar angle.

The secondary beam is affected by the type of surface on which it is reflected as well as by the position of the light source. For instance, when light falls on an uneven or irregular surface such as an unpolished or ragged surface, the absorption effect is higher, because it reduces the strength of the reflected beam of light. To produce specular reflection, surface irregularities need to be smaller than the length of the beam’s radiation, such as in the case of polished metal, glass, plastic or transparent liquid surfaces. On a “perfect” surface, the angle of beam radiation is equivalent to that of the incident radiation.

Specular reflection rarely occurs in nature, but rather in man-made spaces. Still waters are an example of nature’s ability to produce this type of reflection.

The effect of specular reflection

Specular reflection exerts an effect on our perception of objects. Actually, the beam that shoots through the specular reflection has penetrated the surface it touched on by barely half a wavelength. Along this course, the colour of the reflected beam is identical to that of the incident beam.

However, when a ray of light meets an object, its beams do not all go through the occurrence of specular reflection at a reflection angle that is equal to the incident beam. A number of these beams are randomly reflected in multiple directions. This is what is known as diffuse reflection.

Thus, a counter that was crafted of a material that reflects a large number of incident beams might reflect the light source almost perfectly and create a form of blinding “spot” lighting effect. On the other hand, a dull or matte finish that absorbs most of all light beams, or an irregular surface that reflects light beams in an irregular fashion, might diffuse light, but this light would lose its brightness.

How to manage specular reflection

There is no set formula to eliminate the veiling effect on a shiny surface. We can, however, change or improve the angle in order to obtain the desired effect.

Let us look at under-counter lighting in a kitchen that illuminates a shiny surface (see photo above). When taking the type of surface as well as the backsplash into account, lighting experts will recommend that the light source be placed at the front of the cupboard, angled toward the back wall in order to create more diffuse and greater illumination of the work surface (see diagram below).

When the light source is installed at the back of the cupboard, the work space will not receive as much light; the angle of incidence will be far more evident.

Conclusion

So, specular reflection depends on the type of surface. To manage veiling reflections appropriately, luminaires should be installed in strategic fashion. It might be necessary to go through a trial-and-error process before finding the perfect location.

This article was first published by Standard as a blog: www.standardpro.com/what-is-specular-reflection/

Lighting 2

 


 Salex Expands to Southwestern Ontario                                                                   

LDS Salex 12 175

Salex continues to support the Southwestern Ontario market with representation of key market leaders in lighting and controls, including its partnership with Axis Lighting, Beghelli Canada and OSRAM.

Axis Lighting is an innovative, forward-thinking manufacturer delivering high-performance LED luminaires for general, ambient and task lighting in office, commercial and institutional spaces. One of their leading-edge developments includes Stencil. Stencil brings together lighting segments and connectors called Hubs, the building blocks for creating forms and patterns of all sizes. 

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The Jaibot executes its tasks based on building information modeling (BIM) data. The robot is a completely cordless and easy-to-use system that doesn’t require expert skills. It locates itself accurately indoors, drills the holes dust-controlled and finally marks them according to the trade. 

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EIN AEA virtual 400Mark your calendars for Nov. 24-25 and get ready for a virtual trade show and amazing technical presentations. AEA, the exhibitors and presenters are so excited to present this event to the entire province of Alberta.

Attendees will have easy access to virtual booths with an opportunity to have their questions answered by qualified people, and win some prizes throughout the days at both the trade show Virtual Floor and by attending the seminars.

 

Go HERE to register and for the full event details

 

 


 



Lighting ControlsBy Jeremy Day

Building a control system for a modern lighting installation can seem like an impossibly complex task. To simplify it, a systematic approach to understanding the needs of the design, facility, and user can be employed. In this white paper, we aim to define the questions one must answer to construct an appropriate control system.

First, and perhaps counterintuitively, one must start with the control narrative. A lighting programming and control narrative is a document that is essential to coordinate the design/construction process with a fully realized final architectural product. 

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Terry BeckerBy Terry Becker

Changes in the CSA Z462 Workplace electrical safety standard are slowing down. Good news! The 2021 edition will see significant reorganization of content in Clause 4.1, changes to existing annexes, some new annexes and a significant change to the arc flash PPE category method of determining “additional protective measures” for a work task’s arc flash risk assessment are included in the 2021 edition.

CSA Z462 2021 edition will not be 100% technically harmonized with the 2021 edition of NFPA 70E...


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Shat-R-Shield Ironclad VR ProShat-R-Shield's Correctional Cell Fixture is designed to withstand extreme abuse by using materials that are virtually indestructible. Built with 1/2" thick 304 Stainless Steel and a cast .400" thick diffused lens, this light fixture is built to withstand hard/repetitive impacts and its tight design offers no point of entry.

The Ironclad® Vandal-Resistant (VR Pro) fixture uses an LED high efficiency light engine with a cool light that simulates daylight. The incorporated count light LED module can be turned on and off. Tested to Canadian and US standards by Underwriters' Laboratories, this fixture carries a cULus rating.

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M12™ Heated TOUGHSHELL™ Jacket KitOur heated TOUGHSHELL™ jacket is powered by our powerful M12™ REDLITHIUM™ batteries. Each heated jacket uses carbon fiber heating elements to create and distribute heat to your chest, back and front hand pockets. A one-touch LED controller heats up the battery heated jacket to three heat settings, creating a comfortable heat for any environment or weather.

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Rutul Bhavsar 1 400By Blake Marchand

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Sustainability at Mohawk College. Rutul’s interests lie in the more progressive areas of the industry, automation, control, and energy efficient technologies. It is no doubt a positive sign for the industry to have talented individuals such as Rutul who are passionate about contributing to a more sustainable future. 

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