Canadian Electrical Industry News Week

 

May 28, 2018

HorticultureAn evaluation of the energy and economic performance of LED horticultural luminaires compared with high-pressure sodium (HPS) and metal halide (MH) horticultural luminaires has found that the LEDs cannot replace HPS luminaires on a one-for-one basis while still maintaining the original photosynthetic photon flux density (PPFD).

The evaluation was conducted by the Lighting Research Center (LRC) at Rensselaer Polytechnic Institute, and funded in part by Natural Resources Canada. Based on findings from a literature review and online survey conducted by the LRC in 2016, the project team developed a framework for evaluating and comparing horticultural luminaires. The framework includes recommended testing, evaluation, and reporting methods. It allows luminaires to be compared based on equal PPFD. PPFD for plants is analogous to photopic illuminance on a work surface in an architectural application. The framework includes an analysis of 11 luminaire-specific metrics and 5 application-specific metrics, which provide growers with the best available information regarding any given horticultural luminaire’s performance.

The LRC then used this framework to test and evaluate 13 horticultural luminaires, including 10 LED, 2o HPS, and one MH product.* First, the LRC photometrically tested individual luminaires. Then the LRC modelled the use of the luminaires in a simulated greenhouse to assess the number of luminaires and the lighting system energy requirements necessary to reach minimum PPFD and uniformity criteria.

The results show that intensity distribution plays an important role, illustrated by the fact that two of the tested LED luminaires had higher luminaire efficacy than the HPS luminaires but still had a higher total power demand in the greenhouse application.

The LRC found an increase in shading from LED luminaires compared with HPS luminaires due to the size of the luminaires and the fact that more are needed to provide the same PPFD in a greenhouse. The shading from LED luminaires reduces daylight in a greenhouse by 13% to 55% compared with a 5% reduction in daylight from HPS luminaires, thus more electric energy could be needed for lighting with the LED systems, depending upon the available daylight.

The greater number of LED luminaires and their equivalency, on average, in application power demand impacted their life-cycle costs. The LRC found that three of the tested LED horticultural luminaire lighting systems had lower life-cycle costs and the remaining seven had higher life-cycle costs than either of the two 1000-watt HPS lighting systems that were tested.

The results of the evaluation show that stakeholders can be misled by considering luminaire efficacy alone. Rather, the luminaire intensity distribution and layout to reach a criterion PPFD are necessary for an accurate life cycle cost analysis. The LRC report provides a technology-neutral framework that stakeholders can use to evaluate lighting systems.

The project was funded by the Lighting Energy Alliance and Natural Resources Canada. Members of the Lighting Energy Alliance include Efficiency Vermont, Energize Connecticut, National Grid, and the Northwest Energy Efficiency Alliance.

View the report

This article is a lightly edited version of the report’s introduction.

Photo source: Philips Lighting

* The results in this report are based on electrical and photometric testing of one luminaire sample per model. Life testing was not conducted for this project. No crops were grown or evaluated with any of the tested luminaires.

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Electrician Forum Brought to you by Schneider Electric

As industry experts you know the products you use everyday better than anyone and should have input on what information you receive about products and what could improve them.

Therefore, we want your insight on the biggest challenges or issues you face when installing loadcentres, breakers (CAFI, GFI's…) and other surge protection devices. We ask that you do not provide product specific details but rather your general issues and concerns or any questions that have come to mind while working with these product types. Provide us with your valued expert insight into the issues you have faced so manufacturers can better inform you about the installation and use of these products. Lets generate some discussion that will help guide the Industry.

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Cloud

There has been a lot of talk about cloud computing and Software-as-a-Service (SaaS) models these days but both are relatively new to the lighting industry. Let’s take a look at what they are as well as their roles in commercial lighting.

What is cloud computing?

Cloud computing is the on-demand delivery of compute power, database storage, and applications via the Internet with pay-as-you-go or subscription-based pricing. Cloud computing means that instead of all the computer hardware, software, and data that you are using sitting somewhere inside your company’s network, it’s provided and managed for you as a service by another company and you access it over the Internet. 

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Copper $US Dollar price per pound


 

Jean-Marc Myette

By Line Goyette

Meeting people in our industry often comes with surprises. This was the case with Jean-Marc Myette, Business Development Manager of ABB’s Electrification Products Division and chair of the Board of Electro-Federation Canada’s Quebec section. Not only does he know the electrical industry down to the most minute product and technological innovations, he is also a professional car racer on sabbatical, and someone very involved in his business community and personal life.

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